| Feature | X | Y | Map | AKA | Parish | County | Type | Feature Meaning |
| U. of Ulster at Coleraine | 84 | 34 | 4 | Derry | ||||
| Ubberboy Burn | 18 | 21 | 9 | Antrim | ||||
| Ubberdwalty Burn | 76 | 1 | 8 | Derry | ||||
| Ulster American Folk Park | 42 | 79 | 12 | Tyrone | ||||
| Ulster Cottages | 6 | 40 | 20 | Down | ||||
| Ulster Cottages | 32 | 93 | 12 | Tyrone | ||||
| Ulster Cottages | 34 | 59 | 20 | Down | ||||
| Ulster Cottages | 41 | 60 | 21 | Down | ||||
| Ulster Cottages | 48 | 72 | 13 | Cappagh | Tyrone | |||
| Ulster Way North Down Path | 42 | 81 | 15 | Down | ||||
| Ulster Way, The | 41 | 38 | 21 | Down | ||||
| Ulster Way, The | 58 | 39 | 21 | Down | ||||
| Ulster Way, The | 59 | 48 | 21 | Down | ||||
| Ultimo House | 90 | 80 | 14 | Derry | ||||
| Umbra | 72 | 35 | 4 | Derry | ||||
| Umbra Bridge | 73 | 35 | 4 | Derry | ||||
| Umgall House | 25 | 79 | 15 | Antrim | ||||
| Umley | 48 | 29 | 7 | Donegal | ||||
| Ummer | 32 | 48 | 18 | Fermanagh | ||||
| Umrycam | 62 | 4 | 7 | Banagher | Derry | T | ||
| Umrycam Hill | 61 | 3 | 7 | Banagher | Derry | |||
| Unagh | 78 | 80 | 13 | Lissan | Tyrone | T | ||
| Unan, Lough | 8 | 71 | 12 | Donegal | ||||
| Unicarval | 44 | 71 | 15 | Newtownards | Down | T | ||
| Unicarval | 45 | 71 | 21 | Dundonald | Down | T | ||
| Unicks | 85 | 69 | 19 | Donaghenry | Tyrone | T | ||
| Union Hill | 21 | 52 | 20 | Down | ||||
| Union Lodge | 36 | 59 | 20 | Down | ||||
| Union Workhouse | 45 | 73 | Old | Tyrone | ||||
| University of Ulster at Jordanstown | 36 | 84 | 15 | Antrim | ||||
| Unshanagh | 21 | 31 | 5 | Antrim | ||||
| Unshinagh | 1 | 49 | 20 | Armagh | T | |||
| Unshinagh | 26 | 15 | 9 | Finvoy | Antrim | T | ||
| Unshinagh | 35 | 71 | 12 | Longfield East | Tyrone | T | ||
| Unshinagh | 99 | 20 | 4 | Antrim | ||||
| Unshinagh | 99 | 20 | 8 | Antrim | ||||
| Unshinagh (Lower & Upper) | 30 | 96 | 6 | Clonleigh | Donegal | T | ||
| Unshinagh (Lower & Upper) | 30 | 96 | 12 | Clonleigh | Donegal | T | ||
| Unshinagh Glen | 34 | 72 | 12 | Tyrone | ||||
| Upper Bridge | 14 | 82 | 14 | Antrim | ||||
| Upper Lake | 39 | 43 | 20 | Down | ||||
| Upper Town | 84 | 86 | 13 | Derry | ||||
| Upper Town | 90 | 99 | 14 | Derry | ||||
| Upperlands | 87 | 4 | 8 | Derry | ||||
| Upperthird | 27 | 81 | 12 | Ardstraw | Tyrone | T | ||
| Uppertown | 3 | 17 | 8 | Antrim | ||||
| Uppertown | 10 | 64 | 20 | Antrim | ||||
| Uppertown | 46 | 7 | 7 | Tyrone | ||||
| Upton Park | 22 | 85 | 14 | Antrim | ||||
| Urbal | 3 | 18 | 8 | Antrim | ||||
| Urbal | 89 | 78 | x | Tamlaght | Tyrone | T | ||
| Urbal | 98 | 32 | 4 | Antrim | ||||
| Urbal | 98 | 32 | 5 | Antrim | ||||
| Urbal House | 89 | 78 | 14 | Tamlaght | Tyrone | |||
| Urbalreagh | 35 | 88 | 12 | Ardstraw | Tyrone | T | ||
| Urbalreagh | 84 | 72 | x | Donaghenry | Tyrone | T | ||
| Urbalreagh Lough | 35 | 88 | 12 | Ardstraw | Tyrone | |||
| Urney | 30 | 94 | x | Urney | Tyrone | T | ||
| Urney Cottage | 30 | 94 | 12 | Urney | Tyrone | |||
| Urney Glebe | 30 | 94 | x | Urney | Tyrone | T | ||
| Urney Hill | 31 | 92 | 12 | Urney | Tyrone | |||
| Urney Park | 30 | 94 | 6 | Urney | Tyrone | |||
| Urney Park | 30 | 94 | 12 | Urney | Tyrone | |||
| Ushet Lough | 15 | 48 | 5 | Antrim | ||||
| Ushet Point | 15 | 47 | 5 | Antrim | ||||
| Ushet Port | 15 | 47 | 5 | Antrim | ||||
| Usnagh | 54 | 66 | 18 | Anosina | Clogherny | Tyrone | T | Place of Fawn |
| Ussher's Bridge | 11 | 65 | 20 | Antrim | ||||
| Valley View Farm | 5 | 53 | 20 | Armagh | ||||
| Vallyagan, Lower | 85 | 17 | 8 | Derry | ||||
| Vanishing Lake | 20 | 36 | 5 | Loughareema | Antrim | |||
| Veagh | 26 | 13 | 6 | Raymoghy | Donegal | T | ||
| Vechile Insp Centre | 31 | 71 | 15 | Antrim | ||||
| Veenagreane, Lough | 18 | 74 | 12 | Donegal | ||||
| Vermount | 35 | 57 | 20 | Down | ||||
| Verners Bridge | 88 | 60 | 19 | Tyrone | ||||
| Veterinary Invest. Centre | 43 | 74 | 12 | Tyrone | ||||
| Veterinary Research Station | 40 | 74 | 15 | Down | ||||
| Vias Bridge | 56 | 54 | 18 | Tyrone | ||||
| Vicarge Farm | 9 | 50 | 20 | Down | ||||
| Victoria Bridge | 34 | 90 | 12 | Tyrone | ||||
| Victoria Channel | 35 | 76 | 15 | Down | ||||
| Victoria Park | 36 | 75 | 15 | Down | ||||
| Vinecash | 97 | 53 | 19 | Armagh | ||||
| Vinegar Hill | 38 | 59 | 18 | Tyrone | ||||
| Vinegar Hill | 55 | 87 | 13 | Tyrone | ||||
| Violet Hill | 4 | 45 | 20 | Armagh | ||||
| Violet Hill | 6 | 87 | 14 | Antrim | ||||
| Violet Hill | 97 | 33 | 4 | Antrim | ||||
| Violet Hill | 97 | 33 | 5 | Antrim | ||||
| Visitors Centre | 21 | 20 | 9 | Antrim | ||||
| Vow | 91 | 17 | 8 | Antrim | ||||
| Waituna House | 90 | 89 | 14 | Derry | ||||
| Walk Mill | 93 | 39 | 4 | Antrim | ||||
| Walk Mill | 93 | 39 | 5 | Antrim | ||||
| Walkmill | 7 | 18 | 8 | Antrim | ||||
| Walkmill | 25 | 93 | 15 | Kilbride | Antrim | T | ||
| Walkmill Bridge | 26 | 85 | 15 | Antrim | ||||
| Wallace Hill | 48 | 50 | 21 | Down | ||||
| Wallace Park | 22 | 85 | 14 | Antrim | ||||
| Wallace Park | 48 | 63 | 21 | Down | ||||
| Wallace's Bridge | 44 | 63 | 21 | Down | ||||
| Wallaces Rocks | 63 | 67 | 15 | Down | ||||
| Wallaces Rocks | 64 | 67 | 21 | Down | ||||
| Wallacestown | 8 | 97 | 14 | Antrim | ||||
| Wallburn Bridge | 17 | 88 | 14 | Antrim | ||||
| Wallburn House | 19 | 97 | 14 | Antrim | ||||
| Wallburn House | 19 | 97 | 9 | Antrim | ||||
| Walls Town | 87 | 91 | 14 | Derry | ||||
| Walls, The | 1 | 37 | 5 | Antrim | ||||
| Wallsteads | 2 | 41 | 5 | Antrim | ||||
| Walshestown | 54 | 49 | 21 | Saul | Down | T | ||
| Walshestown Castle | 54 | 49 | 21 | Down | ||||
| Walter Rocks, The | 58 | 51 | 21 | Down | ||||
| Walworth | 60 | 22 | 4 | Derry | ||||
| Walworth | 60 | 22 | 7 | Derry | ||||
| War Mem., Co. Antrim | 36 | 86 | 15 | Antrim | ||||
| War Meml | 86 | 20 | 8 | Derry | ||||
| Warbleshinny | 43 | 12 | 7 | Derry | ||||
| Ward Park | 51 | 81 | 15 | Down | ||||
| Waring Bank | 51 | 53 | 18 | Tyrone | ||||
| Waringford | 23 | 48 | 20 | Down | ||||
| Waringstown | 10 | 55 | 20 | Down | ||||
| Warren Bay | 66 | 40 | 4 | Donegal | ||||
| Warren Hill | 94 | 93 | 14 | Derry | ||||
| Warren Point | 53 | 57 | 21 | Down | ||||
| Warren Wood | 71 | 71 | 13 | Tyrone | ||||
| Warren, Old | 26 | 63 | 20 | Antrim | ||||
| Warren, The | 46 | 78 | 15 | Down | ||||
| Warrentown | 3 | 16 | 6 | Gartan | Donegal | T | ||
| Warrentown Mountain North | 97 | 17 | 6 | Gartan | Donegal | T | ||
| Warrentown Mountain South | 98 | 16 | x | Gartan | Donegal | T | ||
| Washing Bay | 90 | 66 | 19 | Tyrone | ||||
| Washing Lough | 93 | 12 | 8 | Derry | ||||
| Washington Rock | 56 | 62 | 21 | Down | ||||
| Watch Hill | 37 | 93 | 15 | Antrim | ||||
| Watch Hill | 52 | 64 | 21 | Down | ||||
| Water Foot, Far | 95 | 89 | 14 | Derry | ||||
| Water Hill | 34 | 77 | 12 | Tyrone | ||||
| Water Hill | 77 | 48 | 19 | Armagh | ||||
| Water Hill Fort | 11 | 40 | 20 | Down | ||||
| Water Rock | 54 | 34 | 21 | Down | ||||
| Water Sports Centre | 4 | 57 | 20 | Armagh | ||||
| Water Top | 20 | 37 | 5 | Antrim | ||||
| Water Top Open Farm | 19 | 38 | 5 | Antrim | ||||
| Waterfall Bridge | 67 | 4 | 7 | Derry | ||||
| Waterfoot | 24 | 25 | 5 | Glenariff | Antrim | |||
| Waterfoot Bridge | 11 | 75 | 14 | Antrim | ||||
| Waterfoot, Near | 95 | 89 | 14 | Derry | ||||
| Waterhill Plantation | 33 | 78 | 12 | Tyrone | ||||
| Waterloo hill | 44 | 2 | 7 | Tyrone | ||||
| Waterquarter | 6 | 12 | 8 | Antrim | ||||
| Waterside | 44 | 16 | 7 | Derry | ||||
| Waterwheel Farm | 22 | 93 | 12 | Donegal | ||||
| Watson's Island | 50 | 63 | 21 | Down | ||||
| Watson's Lough | 30 | 49 | 18 | Fermanagh | ||||
| Watsons Bridge | 27 | 59 | 20 | Down | ||||
| Watsonsgrove | 23 | 53 | 20 | Down | ||||
| Watt's Town | x | Coleraine | Derry | T | ||||
| Wattys Hill | 14 | 6 | 9 | Antrim | ||||
| Waughs Cross Roads | 93 | 41 | 19 | Armagh | ||||
| Weddell Bridge | 78 | 96 | 13 | Derry | ||||
| Wee Buckey Knowe | 57 | 57 | 21 | Down | ||||
| Wee Frosses | 6 | 15 | 8 | Antrim | ||||
| Wee Pill | 56 | 36 | 21 | Down | ||||
| Wee Rock Mallaugh | 64 | 50 | 21 | Down | ||||
| Wee Scar | 58 | 56 | 21 | Down | ||||
| Wee Slievenanee | 16 | 22 | 9 | Antrim | ||||
| Wee Wife | 53 | 50 | 21 | Down | ||||
| Weir Houses, The | 38 | 47 | 20 | Down | ||||
| Welchtown | 8 | 96 | 12 | Kilteevoge | Donegal | T | ||
| Welchtown | 8 | 97 | 6 | Kilteevoge | Donegal | T | ||
| Well Water | 8 | 33 | 5 | Antrim | ||||
| Well's Cross | 8 | 53 | 20 | Down | ||||
| Wellbrock Beetling Mill | 74 | 79 | 13 | Tyrone | ||||
| Wellbrook | 75 | 79 | 13 | Tyrone | ||||
| Wellhead | 46 | 91 | 15 | Antrim | ||||
| Wellmont | 7 | 97 | 14 | Antrim | ||||
| West Boretree Rock | 53 | 67 | 21 | Down | ||||
| West Division | 36 | 88 | x | Carrickfergus | Antrim | T | ||
| West Dougherty Rock | 57 | 63 | 21 | Down | ||||
| West Glebe | x | Ballyscullion | Derry | T | ||||
| West Isle | 85 | 42 | 4 | Antrim | ||||
| West Rock | 51 | 68 | 15 | Down | ||||
| West Rock | 51 | 68 | 21 | Down | ||||
| West Rock | 56 | 61 | 21 | Down | ||||
| West Winds | 48 | 72 | 15 | Down | ||||
| West Winds | 48 | 72 | 21 | Down | ||||
| Western Screen Wood | 45 | 52 | 18 | Tyrone | ||||
| Westgrove | 25 | 84 | 15 | Antrim | ||||
| Westlawn | 55 | 9 | 7 | Derry | ||||
| Wetland & Wildfowl Reserve | 49 | 67 | 15 | Down | ||||
| Wetlands and Wildfowl Reserve | 50 | 67 | 21 | Down | ||||
| Whale Head | 27 | 22 | 6 | Donegal | ||||
| Whanstown | 18 | 97 | 14 | Antrim | ||||
| Whappstown | 21 | 97 | 14 | Connor | Antrim | T | ||
| Whappstown | 21 | 97 | 9 | Connor | Antrim | T | ||
| Whappstown Bridge | 20 | 98 | 14 | Connor | Antrim | |||
| Whappstown Bridge | 20 | 98 | 9 | Antrim | ||||
| Whaps Hill | 45 | 90 | 15 | Antrim | ||||
| Whaup Rock | 54 | 67 | 15 | Down | ||||
| Whaup Rock | 54 | 67 | 21 | Down | ||||
| Wheat Field | 97 | 48 | 19 | Armagh | ||||
| Wheatfield | 66 | 26 | 4 | Derry | ||||
| Wheatfield | 66 | 26 | 7 | Derry | ||||
| Whigamstown | 49 | 38 | 21 | Down | ||||
| Whigamstown | 49 | 39 | x | Bright | Down | T | ||
| Whiglagh | 3 | 8 | 8 | Antrim | ||||
| Whin Hill | 95 | 9 | 8 | Derry | ||||
| Whinhill | 97 | 37 | 4 | Antrim | ||||
| Whinhill | 97 | 37 | 5 | Antrim | ||||
| Whinland | 38 | 4 | 7 | Tyrone | ||||
| Whinney Park | 59 | 45 | 21 | Down | ||||
| Whinny Hill | 15 | 11 | 6 | Donegal | ||||
| Whinny Hill | 59 | 66 | 21 | Down | ||||
| Whinny Hill | 96 | 14 | 8 | Antrim | ||||
| Whisker Hill | 31 | 89 | 12 | Tyrone | ||||
| Whiskin Shore | 61 | 73 | 21 | Down | ||||
| Whistlebare | 61 | 7 | 7 | Derry | ||||
| Whistlebare | 66 | 13 | 7 | Derry | ||||
| Whistlebare | 97 | 15 | 8 | Antrim | ||||
| White Arch | 25 | 24 | 9 | Antrim | ||||
| White Bay | 63 | 39 | 4 | Donegal | ||||
| White Bay | 68 | 42 | 4 | Donegal | ||||
| White Brae | 32 | 4 | 9 | Antrim | ||||
| White Bridge | 4 | 49 | 20 | Down | ||||
| White Bridge | 36 | 83 | 12 | Tyrone | ||||
| White Bridge | 62 | 62 | 19 | Tyrone | ||||
| White Bridges | 87 | 22 | 4 | Derry | ||||
| White Bridges | 87 | 22 | 8 | Derry | ||||
| White Burn | 70 | 5 | 8 | Derry | ||||
| White Cock | 17 | 98 | 12 | Donegal | ||||
| White Cross | 29 | 3 | 6 | Donegal | ||||
| White Drumsonnus | 28 | 54 | 18 | Tyrone | ||||
| White Fort | 42 | 85 | 12 | Tyrone | ||||
| White Fort | 45 | 63 | 18 | Tyrone | ||||
| White Fort | 81 | 96 | 13 | Derry | ||||
| White Fort Cashel | 36 | 44 | 20 | Down | ||||
| White Fort Cashel | 36 | 45 | 20 | Down | ||||
| White Fort Cashel | 39 | 2 | 7 | Tyrone | ||||
| White Glen | 29 | 73 | 12 | Tyrone | ||||
| White Hall | 9 | 40 | 5 | Gortamaddy | Romoan | Antrim | T | |
| White Hall | 14 | 7 | 9 | Antrim | ||||
| White Hall | 19 | 81 | 14 | Antrim | ||||
| White Hall | 86 | 95 | 14 | Derry | ||||
| White Head | 8 | 44 | 5 | Kinbane Head | Antrim | |||
| White Head | 47 | 91 | 15 | Templecorran | Antrim | T | ||
| White Hill | 0 | 32 | 5 | Antrim | ||||
| White Hill | 1 | 12 | 8 | Antrim | ||||
| White Hill | 13 | 71 | 12 | Donegal | ||||
| White Hill | 14 | 96 | 12 | Donegal | ||||
| White Hill | 16 | 53 | 20 | Down | ||||
| White Hill | 18 | 47 | 20 | Down | ||||
| White Hill | 20 | 95 | 12 | Donegal | ||||
| White Hill | 25 | 72 | 15 | Antrim | ||||
| White Hill | 25 | 92 | 12 | Donegal | ||||
| White Hill | 26 | 43 | 18 | Fermanagh | ||||
| White Hill | 27 | 17 | 9 | Antrim | ||||
| White Hill | 31 | 53 | 20 | Down | ||||
| White Hill | 33 | 47 | 20 | Down | ||||
| White Hill | 35 | 78 | 12 | Tyrone | ||||
| White Hill | 40 | 44 | 18 | Fermanagh | ||||
| White Hill | 42 | 54 | 21 | Down | ||||
| White Hill | 42 | 92 | 15 | Antrim | ||||
| White Hill | 48 | 41 | 18 | Fermanagh | ||||
| White Hill | 51 | 40 | 18 | Fermanagh | ||||
| White Hill | 57 | 73 | 15 | Down | ||||
| White Hill | 57 | 73 | 21 | Down | ||||
| White Hill | 70 | 72 | 13 | Tyrone | ||||
| White Hill | 84 | 74 | 13 | Tyrone | ||||
| White Hill | 85 | 97 | 14 | Derry | ||||
| White Hill | 89 | 5 | 8 | Derry | ||||
| White Hill | 92 | 19 | 8 | Antrim | ||||
| White Hill, The | 29 | 42 | 20 | Down | ||||
| White House | 8 | 75 | 14 | Antrim | ||||
| White House | 34 | 81 | x | Carnmoney | Antrim | T | ||
| White House | 38 | 18 | 7 | Ballymagrorty | Templemore | Derry | T | |
| White House | 64 | 55 | 21 | Down | ||||
| White Island | 10 | 7 | 9 | Antrim | ||||
| White Island | 20 | 50 | 18 | Fermanagh | ||||
| White Lady | 29 | 24 | 9 | Cloghastucan | Antrim | |||
| White Lough | 22 | 60 | 18 | Fermanagh | ||||
| White Lough | 46 | 98 | 13 | Tyrone | ||||
| White Lough | 66 | 73 | 13 | Tyrone | ||||
| White Lough | 70 | 52 | 19 | Aghanloo | Tyrone | |||
| White Mountain | 23 | 67 | 20 | Antrim | ||||
| White Mountain | 74 | 2 | 8 | Derry | ||||
| White Park | 30 | 92 | 15 | Antrim | ||||
| White Park | 37 | 42 | 18 | Fermanagh | ||||
| White Park | 1 | 44 | x | Ballinatoy | Antrim | T | ||
| White Park Bay | 1 | 44 | 5 | Ballinatoy | Antrim | |||
| White Rock | 21 | 97 | 12 | Donegal | ||||
| White Rock | 56 | 10 | 7 | Derry | ||||
| White Rock, The | 30 | 72 | 12 | Tyrone | ||||
| White Rocks | 52 | 46 | 18 | Tyrone | ||||
| White Rocks | 89 | 41 | 4 | Antrim | ||||
| White Stone, The | 25 | 84 | 12 | Tyrone | ||||
| White Strand | 67 | 41 | 4 | Donegal | ||||
| White Strand Ross | 67 | 41 | 4 | Donegal | ||||
| White Strand, The | 33 | 29 | 7 | Donegal | ||||
| White Water | 77 | 90 | 13 | Derry | ||||
| White Water Bridge | 76 | 93 | 13 | Derry | ||||
| Whiteabbey | 35 | 82 | 15 | Carnmoney | Antrim | T | ||
| Whitebank Pladdy | 57 | 62 | 21 | Down | ||||
| Whitebay | 32 | 15 | 9 | Antrim | ||||
| Whitebay Point | 32 | 15 | 9 | Antrim | ||||
| Whitechurch | 62 | 70 | 15 | Ballywalter | Down | T | ||
| Whitechurch | 62 | 70 | 21 | Ballywalter | Down | T | ||
| Whitefalls | 86 | 15 | 8 | Derry | ||||
| Whitegate | 94 | 38 | 4 | Antrim | ||||
| Whitegate | 94 | 38 | 5 | Antrim | ||||
| Whitehaw | 24 | 0 | 9 | Antrim | ||||
| Whitehead | 47 | 91 | 15 | Antrim | ||||
| Whitehill | 6 | 20 | 6 | Gartan | Donegal | T | ||
| Whitehill | 9 | 10 | 6 | Conwal | Donegal | T | ||
| Whitehill | 10 | 90 | 14 | Antrim | ||||
| Whitehill | 20 | 95 | 6 | Donaghmore | Donegal | T | ||
| Whitehill | 22 | 52 | 18 | Fermanagh | ||||
| Whitehill | 34 | 7 | 6 | Taughboyne | Donegal | T | ||
| Whitehill | 34 | 7 | 7 | Taughboyne | Donegal | T | ||
| Whitehill | 51 | 18 | 7 | Derry | ||||
| Whitehill | 33 | 44 | 18 | Fermanagh | ||||
| Whitehill Bridge | 11 | 89 | 14 | Antrim | ||||
| Whitehill Cottages | 5 | 19 | 8 | Antrim | ||||
| Whitehill House | 23 | 52 | 18 | Fermanagh | ||||
| Whitehill House | 51 | 18 | 7 | Derry | ||||
| Whitehill House | 65 | 10 | 7 | Derry | ||||
| Whitehills | 56 | 44 | x | Saul | Down | T | ||
| Whitehouse | 30 | 83 | 12 | Ardstraw | Tyrone | T | ||
| Whitehouse | 34 | 80 | 15 | Antrim | ||||
| Whitehouse | 37 | 11 | 7 | Killea | Donegal | T | ||
| Whitequarter | 6 | 90 | 14 | Antrim | ||||
| Whiteridge | 23 | 99 | 14 | Antrim | ||||
| Whiterock | 29 | 74 | 15 | Antrim | ||||
| Whiterock | 52 | 61 | 21 | Down | ||||
| Whitesides Corner | 6 | 96 | 14 | Antrim | ||||
| Whitesides Fort | 14 | 74 | 14 | Antrim | ||||
| Whitespots | 49 | 76 | 15 | Newtownards | Down | T | ||
| Whitespots Country Park | 49 | 76 | 15 | Down | ||||
| Whitestown | 19 | 81 | 14 | Antrim | ||||
| Whitetown | 81 | 69 | 19 | Tullyniskan | Tyrone | T | ||
| Whitewater Bridge | 79 | 89 | 13 | Derry | ||||
| Whitewell | 33 | 80 | 15 | Antrim | ||||
| Whitish Hill | 46 | 99 | 9 | Antrim | ||||
| Widgeon Lodge | 63 | 26 | 7 | Derry | ||||
| Widgeon Lodge | 64 | 26 | 4 | Derry | ||||
| Widow Magees Bridge | 40 | 66 | 18 | Tyrone | ||||
| Widow Steeles Bridge | 87 | 97 | 14 | Derry | ||||
| Wildlife Center | 46 | 52 | 21 | Down | ||||
| Wileys Fort | 31 | 90 | 15 | Antrim | ||||
| William, Fort | 18 | 58 | 20 | Down | ||||
| Williamson Park | 91 | 28 | 5 | Antrim | ||||
| Williamson Park | 92 | 28 | 8 | Antrim | ||||
| Willmount | 28 | 75 | 12 | Longfield West | Tyrone | T | ||
| Willmount Glen | 28 | 74 | 12 | Tyrone | ||||
| Willowbrook House | 20 | 86 | 14 | Antrim | ||||
| Willowdale | 29 | 67 | 15 | Antrim | ||||
| Willowdale | 29 | 67 | 20 | Antrim | ||||
| Willowfield | 35 | 72 | 15 | Down | ||||
| Willowvale | 12 | 62 | 20 | Antrim | ||||
| Willsborough | 50 | 22 | 7 | Derry | ||||
| Willy's Wood Island | 55 | 78 | 15 | Down | ||||
| Wilmount | 45 | 0 | 7 | Tyrone | ||||
| Wilmount | 99 | 41 | 19 | Armagh | ||||
| Wilson Ho | 14 | 6 | 9 | Antrim | ||||
| Wilson's Fort | 18 | 0 | x | Killynure | Convoy | Donegal | T | |
| Wilson's Hill | 96 | 49 | 19 | Armagh | ||||
| Wilsons Point | 49 | 82 | 15 | Down | ||||
| Wilsonstown Lower | 78 | 49 | 19 | Armagh | ||||
| Wilsonstown Upper | 78 | 49 | 19 | Armagh | ||||
| Wind Pump | 10 | 9 | 9 | Antrim | ||||
| Windmill Farm | 7 | 4 | 6 | Donegal | ||||
| Windmill Farm | 92 | 76 | 14 | Tyrone | ||||
| Windmill Hill | 9 | 52 | 20 | Down | ||||
| Windmill Hill | 29 | 58 | 20 | Down | ||||
| Windmill Hill | 41 | 58 | 21 | Down | ||||
| Windmill Hill | 60 | 50 | 21 | Down | ||||
| Windmill Hill | 62 | 69 | 15 | Down | ||||
| Windmill Hill | 62 | 69 | 21 | Down | ||||
| Windmill Hill | 64 | 62 | 21 | Down | ||||
| Windmill Hill | 90 | 90 | 14 | Derry | ||||
| Windmill Plantation | 57 | 48 | 21 | Down | ||||
| Windsor | 32 | 72 | 15 | Antrim | ||||
| Windsor Hill | 51 | 40 | 18 | Fermanagh | ||||
| Windsor Park | 32 | 72 | 15 | Antrim | ||||
| Windy Castle | 82 | 87 | 13 | Derry | ||||
| Windy Gap | 27 | 43 | 20 | Down | ||||
| Windy Gap | 28 | 73 | 15 | Antrim | ||||
| Windy Gap | 45 | 92 | 15 | Antrim | ||||
| Windy Gap Pad | 27 | 43 | 20 | Down | ||||
| Windy Hall | 87 | 30 | 4 | Coleraine | Derry | T | ||
| Windy Hill | 56 | 73 | 13 | Tyrone | ||||
| Windy Hill | 71 | 33 | 4 | Derry | ||||
| Windy Hill | 75 | 29 | 4 | Derry | ||||
| Windy Hill | 75 | 29 | 8 | Derry | ||||
| Windyhall | 16 | 13 | 6 | Conwal | Donegal | T | ||
| Windyhall Bridge | 86 | 31 | 4 | Derry | ||||
| Windyhill | 26 | 83 | 15 | Antrim | ||||
| Windyhill | 40 | 2 | 7 | Donaghedy | Tyrone | T | ||
| Winkle Island | 86 | 42 | 4 | Ballywillin | Antrim | T | ||
| Winny Hill | 59 | 66 | 15 | Down | ||||
| Winnyhaw | 22 | 4 | 6 | Raphoe | Donegal | T | ||
| Winnyhaw | 40 | 88 | 12 | Tyrone | ||||
| Winter Hill | 28 | 51 | 20 | Down | ||||
| Wiskin Shore | 61 | 73 | 15 | Down | ||||
| Wits End Farm | 20 | 70 | 14 | Antrim | ||||
| Woaghternerry | 25 | 46 | 18 | Fermanagh | ||||
| Wolf Bog | 22 | 96 | 14 | Antrim | ||||
| Wolf Bog | 22 | 96 | 9 | Antrim | ||||
| Wolf Hill | 28 | 77 | 15 | Antrim | ||||
| Wolf Island | 92 | 7 | 8 | Derry | ||||
| Wolf Lough | 23 | 46 | 18 | Fermanagh | ||||
| Wolf Water | 29 | 4 | 9 | Antrim | ||||
| Wolfs Hill, The | 73 | 85 | 13 | Tyrone | ||||
| Wolpin Knowe | 20 | 6 | 9 | Antrim | ||||
| Woman's Rock | 57 | 61 | 21 | Down | ||||
| Wood | 31 | 97 | 6 | Clonleigh | Donegal | T | ||
| Wood Brook | 18 | 67 | 20 | Antrim | ||||
| Wood Burn | 66 | 11 | 7 | Derry | ||||
| Wood Burn | 72 | 19 | 8 | Derry | ||||
| Wood Farm | 37 | 45 | 18 | Fermanagh | ||||
| Wood Hill | 0 | 98 | 14 | Antrim | ||||
| Wood Hill | 32 | 57 | 18 | Tyrone | ||||
| Wood Hill | 43 | 58 | 21 | Down | ||||
| Wood Hill | 80 | 80 | 13 | Tyrone | ||||
| Wood Hill | 90 | 13 | 8 | Derry | ||||
| Wood Hills | 37 | 85 | 12 | Tyrone | ||||
| Wood House | 92 | 72 | 14 | Tyrone | ||||
| Wood Island | 33 | 99 | 6 | Clonleigh | Donegal | T | ||
| Wood Island | 33 | 99 | 12 | Clonleigh | Donegal | T | ||
| Wood Island | 50 | 64 | 21 | Down | ||||
| Wood Lough | 76 | 60 | 19 | Clonfeacle | Tyrone | |||
| Wood Mount | 46 | 87 | 13 | Tyrone | ||||
| Wood Vale | 19 | 6 | 9 | Antrim | ||||
| Wood View | 85 | 82 | 14 | Derry | ||||
| Wood, The | 22 | 53 | 20 | Down | ||||
| Wood, The | 87 | 18 | 8 | Derry | ||||
| Wood, The | 93 | 99 | 14 | Derry | ||||
| Wood, The | 95 | 98 | 14 | Derry | ||||
| Wood, Top | 99 | 3 | 8 | Antrim | ||||
| Woodbank | 17 | 68 | 20 | Antrim | ||||
| Woodbank | 54 | 72 | 13 | Tyrone | ||||
| Woodbank House | 83 | 17 | 8 | Derry | ||||
| Woodbrook | 37 | 86 | 12 | Tyrone | ||||
| Woodbrook | 45 | 85 | 13 | Bodoney Lower | Tyrone | T | ||
| Woodburn | 31 | 75 | 12 | Tyrone | ||||
| Woodburn | 85 | 34 | 4 | Derry | ||||
| Woodburn Bridge | 39 | 87 | 15 | Antrim | ||||
| Woodburn Forest | 35 | 89 | 15 | Antrim | ||||
| Woodburn Reservoir, North | 36 | 91 | 15 | Antrim | ||||
| Woodburn Reservoirs, South | 36 | 88 | 15 | Antrim | ||||
| Woodburn River | 37 | 89 | 15 | Antrim | ||||
| Woodend | 36 | 0 | 7 | Leckpatrick | Tyrone | T | ||
| Woodford | 28 | 50 | 20 | Down | ||||
| Woodford | 89 | 43 | 19 | Armagh | ||||
| Woodgrange | 45 | 45 | 21 | Down | Down | T | ||
| Woodgrange Cottage | 44 | 46 | 21 | Down | ||||
| Woodgreen | 12 | 96 | 14 | Antrim | ||||
| Woodhill | 26 | 9 | 6 | Raymoghy | Donegal | T | ||
| Woodhill | 26 | 55 | 18 | Tyrone | ||||
| Woodhill | 79 | 68 | x | Tullyniskan | Tyrone | T | ||
| Woodhill | 95 | 1 | 8 | Derry | ||||
| Woodhill House | 26 | 55 | 18 | Tyrone | ||||
| Woodland | 19 | 14 | 6 | Aghanunshin | Donegal | T | ||
| Woodland Dooish | 10 | 93 | 12 | Donegal | ||||
| Woodland House | 49 | 75 | 13 | Tyrone | ||||
| Woodland House | 51 | 53 | 21 | Down | ||||
| Woodlands | 17 | 93 | 12 | Donegal | ||||
| Woodlands | 29 | 5 | 6 | Taughboyne | Donegal | T | ||
| Woodlands | 36 | 50 | 20 | Down | ||||
| Woodlands | 43 | 79 | 12 | Cappagh | Tyrone | |||
| Woodpark | 16 | 9 | x | Leck | Donegal | T | ||
| Woods, The | 92 | 87 | 14 | Derry | ||||
| Woodside | 21 | 80 | 12 | Termonamongan | Tyrone | T | ||
| Woodside | 98 | 3 | 8 | Antrim | ||||
| Woodside House | 90 | 78 | 14 | Tyrone | ||||
| Woodsvale | 11 | 50 | 20 | Down | ||||
| Woodtown | 13 | 95 | 14 | Antrim | ||||
| Woodtown | 13 | 95 | 9 | Antrim | ||||
| Woodtown | 18 | 17 | 6 | Conwal | Donegal | T | ||
| Woodtown | 71 | 34 | 4 | Derry | ||||
| Woodtown | 87 | 13 | 8 | Derry | ||||
| Woodtown Crossing | 8 | 3 | 8 | Antrim | ||||
| Woodvale | 12 | 88 | 14 | Antrim | ||||
| Woodvale | 31 | 75 | 15 | Antrim | ||||
| Woodvale Cottage | 32 | 50 | 20 | Down | ||||
| Woodvale House | 42 | 75 | 12 | Cappagh | Tyrone | |||
| Woodvale House | 61 | 21 | 4 | Derry | ||||
| Woodvale House | 61 | 21 | 7 | Derry | ||||
| Woodview | 71 | 19 | 8 | Derry | ||||
| Woodview | 91 | 47 | 19 | Armagh | ||||
| Woodview House | 84 | 29 | 4 | Derry | ||||
| Woodview House | 84 | 29 | 8 | Derry | ||||
| Woodview Terace | 44 | 73 | Old | Tyrone | ||||
| Workings | 60 | 62 | 19 | Tyrone | ||||
| Wrack Hole | 63 | 66 | 15 | Down | ||||
| Wrack Hole | 63 | 66 | 21 | Down | ||||
| Wright's Lough | 34 | 58 | 20 | Down | ||||
| Y Bridge, The | 20 | 72 | 14 | Antrim | ||||
| Yanagh | 25 | 50 | 18 | Fermanagh | ||||
| Yellow Horn Hill Plantation | 75 | 51 | 19 | Aghanloo | Tyrone | |||
| Yellow Knowe | 46 | 81 | 13 | Tyrone | ||||
| Yellow Pladdy | 64 | 50 | 21 | Down | ||||
| Yellow Rocks | 59 | 57 | 21 | Down | ||||
| Yelvin, Lough | 17 | 75 | 12 | Tyrone | ||||
| Yewmount | 17 | 70 | 14 | Antrim | ||||
| Yewtree Cottage | 25 | 55 | 20 | Down | ||||
| Yewtree House | 40 | 51 | 21 | Down | ||||
| YMCA | 46 | 14 | 7 | Derry | ||||
| Yoan, Lough | 25 | 42 | 18 | Fermanagh | ||||
| Yorks Town | 91 | 3 | 8 | Derry | ||||
| Young's Bridge | 23 | 62 | 20 | Antrim | ||||
| Youran | 57 | 58 | 21 | Down | ||||
| Zoological Gardens | 32 | 80 | 15 | Antrim |