| Cloughroe, Drumkeen, Co. Donegal | €127,000 | 2014-12-22 |
| Cloughwally, Lettermacaward, Co Donegal | €75,000 | 2018-12-21 |
| Cluain Mhuirt, Milford, Donegal | €80,000 | 2024-06-25 |
| Cluaine Cro Conty Cro, Glencolumbcille, Donegal | €225,000 | 2019-05-08 |
| Clunelly, Quigleys Point, Co. Donegal | €140,000 | 2025-04-29 |
| Clunelly, Quigleys Point, Donegal | €310,000 | 2026-06-09 |
| Clyhore, Ballyshannon, Donegal | €285,000 | 2023-06-09 |
| Cnoc An Ghra, Moyle Hill, Milford | €75,000 | 2018-08-01 |
| Cnoc An Oir, Lough Ibby, Mullaghduff | €250,000 | 2025-07-17 |
| Cnoc Murleog, Downings, Co Donegal | €125,000 | 2017-07-05 |
| Cnoc Na Murlog, Downings, Murlog | €615,000 | 2025-12-18 |
| Cnoc Na Ros, Ardagh, Ballyliffen | €60,000 | 2016-02-01 |
| Cnocahaney, Rossnowlagh, Donegal | €330,000 | 2020-12-03 |
| Cnocfolla, Brinalack, Letterkenny | €71,000 | 2015-10-15 |
| Cnocknamureog, Downings, Donegal | €192,500 | 2015-05-07 |
| Cnocmurlogh, Downings, Co Donegal | €205,000 | 2016-12-22 |
| Coastguard Station House, Rathmullan, Co.donegal | €90,000 | 2019-06-03 |
| Coill, Ballyliffin, Donegal | €180,000 | 2021-03-31 |
| Coirecas, Bunaninver, Brinlack | €130,000 | 2019-01-04 |
| Cois Locha, Mullaghduff, Kincasslagh | €265,000 | 2023-03-09 |
| Coitin Abhainn Na Glinne, Straleel North, Carrick | €178,000 | 2022-04-11 |
| Coitin Na Doiri Beaga, Leitir Ceanainn Co Donegal | €130,000 | 2021-07-02 |
| Colehill, Newtoncunningham | €102,500 | 2012-12-21 |
| Colehill, Newtowncunningham, Donegal | €293,000 | 2023-09-21 |
| Colehill, Newtowncunningham, Lifford | €45,000 | 2020-12-09 |
| Colina Vista, Burnfoot Rd, Sappagh | €215,000 | 2015-04-09 |
| College Farm Rd, Letterkenny, Donegal | €300,000 | 2026-05-22 |
| College Farm Rd, Upr Sallaghagrane, Letterkenny | €140,000 | 2017-10-04 |
| College Farm Road, Letterkenny | €329,000 | 2020-12-18 |
| College Farm Road, Letterkenny, County Donegal | €155,000 | 2025-12-09 |
| College Farm, Letterkenny, Donegal | €295,000 | 2022-06-13 |
| College Rd, Letterkenny, Donegal | €450,000 | 2023-09-15 |
| College St, Ballyshannon, Donegal | €83,000 | 2021-11-15 |
| College Street, Ballyshannon, Co Donegal | €175,000 | 2026-05-27 |
| Collon, Carndonagh, Co Donegal | €115,000 | 2014-06-30 |
| Collon, Carndonagh, Donegal | €170,000 | 2024-12-18 |
| Collyport House, Maghery, Dungloe | €145,000 | 2014-06-19 |
| Commeen, Doochary | €145,000 | 2014-04-22 |
| Commen, Cloghan, Co Donegal | €33,000 | 2026-05-07 |
| Common, Ardara | €23,705 | 2013-06-27 |
| Common, Ardara, Co Donegal | €90,000 | 2023-10-13 |
| Common, Ardara, Donegal | €162,000 | 2021-12-20 |
| Common, Raphoe, Donegal | €80,000 | 2023-01-09 |
| Commons, Killybegs, Donegal | €126,000 | 2021-04-29 |
| Condons, The Mall, Ballyshannon | €155,000 | 2026-04-27 |
| Coneyburrow House, Stralongford, Drumkeen | €125,000 | 2016-02-08 |
| Coneyburrow Rd, Lifford, Donegal | €96,000 | 2022-06-02 |
| Conlin, Kerrykeel Po, Letterkenny | €140,000 | 2024-08-09 |
| Conneyburrow Road, Lifford | €90,000 | 2012-12-11 |
| Consillo, Shore Road, Buncrana | €100,000 | 2013-03-26 |
| Contara, Lackagh, Portnoo | €615,000 | 2022-11-01 |
| Convent Of Mercy, Windyhall, Letterkenny | €255,000 | 2017-07-14 |
| Convent Rd, Carndonagh, Donegal | €285,000 | 2026-09-04 |
| Convent Rd, Letterkenny, Donegal | €150,000 | 2021-12-02 |
| Convent Road, Letterkenny | €47,500 | 2012-07-16 |
| Convent Road, Letterkenny, Co Donegal | €35,000 | 2015-04-22 |
| Convoy Cottage, Bridgestreet, Ramelton | €140,000 | 2017-04-13 |
| Convoy Court, (otherwise Bentley House), Convoy | €300,000 | 2018-12-20 |
| Conwal, Letterkenny | €280,000 | 2011-03-10 |
| Conwal, Letterkenny, Co Dongal | €220,000 | 2015-12-21 |
| Conwal, Letterkenny, Donegal | €245,000 | 2020-03-12 |
| Conwall, Letterkenny, Co Donegal | €207,500 | 2016-12-01 |
| Coocholly, Ballyshannon, Co. Donegal. | €80,000 | 2010-01-12 |
| Cool Beg, Rossnowlagh, Donegal | €210,000 | 2023-11-01 |
| Cooladerry, Fanad, Donegal | €200,000 | 2018-08-03 |
| Cooladerry, Raphoe | €30,000 | 2013-04-15 |
| Cooladerry, Raphoe, Lifford P.o. | €70,000 | 2010-11-08 |
| Coolatee, Ballindrait, Lifford | €160,000 | 2026-06-25 |
| Coolatee, Lifford | €265,000 | 2011-07-16 |
| Coolatee, Lifford, Donegal | €275,000 | 2022-10-28 |
| Coolbeg & Creevy, Rossnowlagh, Co Donegal | €75,000 | 2021-11-22 |
| Coolbeg, Rossnowlagh, Donegal | €140,000 | 2017-01-27 |
| Coolboy Big, Letterkenny, Donegal | €235,000 | 2024-12-12 |
| Coolboy Little, Illistrin, Letterkenny | €415,000 | 2022-02-25 |
| Coolboy, Letterkenny | €45,000 | 2011-10-18 |
| Coolboy, Letterkenny, Co Donegal | €107,000 | 2022-07-21 |
| Coolboy, Letterkenny, Donegal | €180,000 | 2015-02-27 |
| Coolbuoy, Letterkenny, Donegal | €150,000 | 2026-06-17 |
| Coolcholly, Ballure Lane, Ballyshannon | €100,000 | 2017-02-08 |
| Coolcholly, Ballyshannon | €153,846 | 2012-12-20 |
| Coolcholly, Ballyshannon, Co Donegal | €100,000 | 2022-08-10 |
| Coolcholly, Ballyshannon, Donegal | €194,000 | 2024-08-02 |
| Coolcholly, Coolcholly | €118,500 | 2012-08-14 |
| Coolcross View, Culdaff | €50,000 | 2015-08-20 |
| Coole Cranford, Milford Po, Letterkenny | €150,000 | 2023-09-18 |
| Coole Upper, Cranford | €91,000 | 2021-07-06 |
| Coole, Cranford, Letterkenny | €60,000 | 2024-09-25 |
| Cooleen, Cottage Aileach Rd, Buncrana | €83,000 | 2017-08-02 |
| Cooley, Moville, Donegal | €15,000 | 2024-03-05 |
| Cooley, Moville, Lifford | €100,000 | 2024-05-30 |
| Coolmore House, Rossnowlagh, Donegal | €1,420,000 | 2022-12-19 |
| Coolmore, Coolbeg, Rossnowlagh | €100,000 | 2025-04-14 |
| Coolmore, Rossnowlagh | €730,000 | 2011-11-24 |
| Coolmore, Rossnowlagh, Co. Donegal | €185,000 | 2021-11-25 |
| Coolshangan, Inver | €150,000 | 2012-06-13 |
| Coolshannon, Inver, Donegal | €25,000 | 2018-09-21 |
| Coolvoy, Doochary, Donegal | €100,000 | 2021-10-05 |
| Coolyslin Gortnamuck, Castlefin Lifford, Donegal | €270,000 | 2025-09-19 |
| Coolyslin, Castlefin, Co. Donegal | €90,000 | 2025-11-21 |
| Coolyslin, Castlefin, Lifford | €70,000 | 2019-07-04 |
| Coolyslin, Castlefinn, Donegal | €325,000 | 2022-08-10 |
| Coolyslin, Donaghmore, Castlfinn | €75,000 | 2024-05-08 |
| Coopers Rd, Drumbern, Milford | €170,000 | 2015-12-18 |
| Coopers Road, Drumbern, Milford | €40,000 | 2013-04-24 |
| Copany, Donegal Town, Co. Donegal | €125,000 | 2022-06-07 |
| Corakille House, Ardeskin, Donegal Town | €225,000 | 2018-11-29 |
| Corcam, Stranorlar, Donegal | €167,000 | 2021-12-21 |
| Corcashy, Convoy, Donegal | €55,000 | 2015-03-03 |
| Corcreggan, Dunfanaghy | €235,000 | 2012-07-06 |
| Corcreggan, Dunfanaghy, Letterkenny | €185,000 | 2024-11-26 |
| Corcullion, Castlefin, Donegal | €90,000 | 2024-11-11 |
| Corcullion, Castlefin, Lifford | €80,000 | 2024-05-14 |
| Corderry Cottage, Corderry, Churchill | €31,500 | 2015-03-26 |
| Corderry House, Corderry, Churchill Letterkenny | €35,000 | 2014-07-02 |
| Corderry, Churchill, Letterkenny | €84,000 | 2023-01-16 |
| Corefrin, Ballybofey, Donegal | €265,000 | 2018-05-29 |
| Corgary Ballybofey, Ballybofey, Donegal | €135,000 | 2016-09-21 |
| Corgary, Ballybofey | €400,000 | 2024-07-04 |
| Corgary, Ballybofey, Co Donegal | €190,000 | 2023-04-06 |
| Corgary, Ballybofey, County Donegal | €30,000 | 2024-08-13 |
| Corgary, Ballybofey, Donegal | €380,000 | 2025-06-26 |
| Corker Lane, Kilbarron, Rossnowlagh | €120,000 | 2014-11-14 |
| Corker Lane, Rosnowlagh, Ballyshannon | €118,000 | 2015-12-21 |
| Corker Lane, Rossnowlagh, Ballyshannon | €232,000 | 2021-03-22 |
| Corker Lane, Rossnowlagh, Donegal | €270,000 | 2024-11-08 |
| Corker, Rossnowlagh, Co. Donegal | €128,659 | 2024-12-17 |
| Corlea, Ballyshannon | €315,000 | 2021-09-21 |
| Corlea, Ballyshannon, Co Donegal | €90,000 | 2022-09-21 |
| Corlea, Ballyshannon, County Donegal | €22,500 | 2026-09-01 |
| Corlea, Ballyshannon, Donegal | €82,500 | 2021-01-20 |
| Corlecky, Ballybofey | €82,000 | 2013-11-18 |
| Corlecky, Ballybofey, Co Donegal | €115,000 | 2021-03-05 |
| Corlecky, Ballybofey, County Donegal | €25,000 | 2025-09-03 |
| Corlecky, Ballybofey, Lifford | €100,000 | 2024-09-11 |
| Cormullin, Laghey, Co Donegal | €68,200 | 2024-04-22 |
| Cornaghan, Killybegs, County Donegal | €180,000 | 2025-12-17 |
| Cornagill, Gold Course Rd, Letterkenny | €360,000 | 2019-08-02 |
| Cornagill, Golf Course Road, Letterkenny | €615,000 | 2025-01-16 |
| Cornagill, Letterkenny | €355,000 | 2010-04-16 |
| Cornagill, Letterkenny, Donegal | €300,000 | 2025-12-19 |
| Cornaglagh, Ballyshannon, Donegal | €265,000 | 2024-06-21 |
| Cornaveigh, Barnesmore, Donegal | €212,000 | 2020-02-25 |
| Corner Bar (house), Main St, Moville | €95,000 | 2018-12-21 |
| Corner Cafe, Diamond, Carndonagh | €90,000 | 2021-12-03 |
| Corner House Gleneely, Lifford, Donegal | €75,000 | 2021-12-23 |
| Cornish, Carndonagh, Donegal | €120,000 | 2021-07-01 |
| Corporation, Killybegs | €150,000 | 2012-11-09 |
| Corporation, Killybegs, Co Donegal | €50,000 | 2024-10-04 |
| Corporation, Killybegs, Donegal | €275,000 | 2022-09-19 |
| Corr Lecamey Lower, Carndonagh, Donegal | €65,000 | 2019-05-14 |
| Corr Point, Lettermacaward, Co Donegal | €360,000 | 2017-06-27 |
| Corr Point, Lettermacaward, Donegal | €190,000 | 2017-10-13 |
| Corr, Leitirmacaward | €70,000 | 2016-07-29 |
| Corracramph, Barnesmore, Donegal | €160,000 | 2018-09-21 |
| Corradooey, Convoy, County Donegal | €125,000 | 2025-09-23 |
| Corradooey, Killygordon | €32,000 | 2015-12-22 |
| Corradooey, Killygordon, Co Donegal | €64,000 | 2019-07-29 |
| Corrafrin, Ballybofey | €310,000 | 2012-06-05 |
| Corragh, Downings | €80,000 | 2011-07-27 |
| Corragh, Downings, Donegal | €80,000 | 2014-10-06 |
| Corraine, Ballybofey, Co. Donegal | €50,000 | 2026-06-17 |
| Corrakeels, Inver Po, Donegal | €150,000 | 2024-01-23 |
| Corran View, Kill, Dunfanaghy | €440,000 | 2026-01-13 |
| Corranagh, Cullion Rd, Letterkenny | €250,000 | 2015-12-22 |
| Correfrin, Ballybofey, County Donegal | €58,000 | 2024-09-24 |
| Correnagh, Letterkenny | €440,529 | 2023-09-06 |
| Correnagh, Letterkenny, Co Donegal | €150,000 | 2025-12-11 |
| Correnagh, Letterkenny, County Donegal | €195,000 | 2022-12-16 |
| Correnagh, Letterkenny, Donegal | €470,000 | 2024-10-11 |
| Corrig House, Knather Rd, Ballyshannon | €243,000 | 2025-07-18 |
| Corry, Portsalon | €65,000 | 2012-07-31 |
| Corveen, Barnesmore | €190,000 | 2016-11-14 |
| Corveen, Barnesmore, Donegal Town | €214,750 | 2012-03-16 |
| Corveen, Derrybeg | €10,000 | 2014-04-08 |
| Corveen, Derrybeg, Co Donegal | €185,000 | 2025-05-23 |
| Corveen, Derrybeg, Donegal | €160,000 | 2026-06-08 |
| Corveen, Donegal Town | €190,000 | 2015-10-09 |
| Corvin, Buncrana, Lifford | €25,000 | 2019-08-22 |
| Corvish, Carndonagh | €90,000 | 2015-11-25 |
| Corvish, Carndonagh, Co Donegal | €185,000 | 2019-02-22 |
| Cosan Na Geanna Fiaine, Dundrain, Burnfoot | €200,000 | 2011-09-09 |
| Coshclady, Bunbeg | €50,000 | 2012-11-29 |
| Coshclady, Bunbeg, Donegal | €80,000 | 2015-04-01 |
| Coshclady, Bunbeg, Letterkenny | €250,000 | 2024-07-15 |
| Coshclady, Meenderrygamph, Gweedore | €150,000 | 2020-07-20 |
| Coshia, Ballyheerin, Fanad | €115,000 | 2016-11-16 |
| Cottage 1 - Mary Deenys Pub, Ture, Muff | €175,000 | 2018-08-15 |
| Cottage 1 Maple Lodge, Ballyraine, Letterkenny | €189,000 | 2023-02-16 |
| Cottage 1, Carrick, Carrigart | €205,000 | 2023-02-23 |
| Cottage 1, Cornaness Glebe, Ardara | €40,000 | 2025-12-03 |
| Cottage 1, Crocknamurlog, Downings | €167,000 | 2021-10-28 |
| Cottage 1, Maghery, Dunglow | €68,500 | 2021-04-20 |
| Cottage 1, Rathlin O Birne Island, Co Donegal | €120,000 | 2020-07-02 |
| Cottage 2 Maple Lodge, Ballyraine, Letterkenny | €167,000 | 2021-12-07 |
| Cottage 2, Cornaness Glebe, Ardara | €100,000 | 2025-12-03 |
| Cottage 2, Donegal Thatched Cottages, Lower Cruit Island | €175,000 | 2020-07-31 |
| Cottage 2, Maghery, Dungloe | €68,500 | 2020-12-21 |
| Cottage 2, Wesleyan Street, Rathmullan | €65,000 | 2018-07-11 |
| Cottage 29, Rathmullan House Hotel, Rathmullan | €380,000 | 2025-12-01 |
| Cottage 3, Cruit Island Lower, Kincasslagh | €215,000 | 2020-12-01 |