| Coolkill East, Monaghan | €130,000 | 2019-12-16 |
| Coolkill, Ballybay, Co Monaghan | €72,000 | 2023-05-26 |
| Coolkillwest, Scotstown, Co Monaghan | €133,000 | 2015-12-10 |
| Coolmain, Monaghan | €95,000 | 2020-11-30 |
| Coolmuckbane, Monaghan | €200,000 | 2016-05-05 |
| Coolmyckbane, Monaghan | €150,000 | 2023-01-31 |
| Coolnacarte, Scotshouse | €40,310 | 2011-11-07 |
| Coolnacarte, Scotshouse, Monaghan | €185,000 | 2025-01-23 |
| Coolnagratten, Inniskeen | €155,000 | 2011-11-17 |
| Coolnalong, Clones, Co. Monaghan | €355,000 | 2026-04-24 |
| Coolnalong, Clones, Monaghan | €181,000 | 2020-03-30 |
| Coolreagh, Carrickmacross, Monaghan | €275,000 | 2024-11-01 |
| Coolremony, Carrickmacross, Monaghan | €150,000 | 2020-08-14 |
| Coolshanagh Road, Monaghan | €160,000 | 2016-12-20 |
| Coolshannagh Rd, Monaghan | €290,000 | 2022-11-28 |
| Coolshannagh, Monaghan | €150,000 | 2025-08-21 |
| Coolshannagh, Monaghan, Co Monaghan | €71,000 | 2015-12-22 |
| Cooltrimegish, Tullynahinera, Castleblayney | €240,000 | 2024-01-24 |
| Cooltrimegish, Tullynahinnera, Castleblayney | €220,000 | 2020-04-07 |
| Coose, Tullynahinnera, Castleblayney | €600,000 | 2022-11-25 |
| Coraghbrack, Emyvale, Co Monaghan | €113,000 | 2021-08-20 |
| Coraghbrack, Emyvale, County Monaghan | €50,000 | 2022-07-15 |
| Coraghy, Clones | €70,500 | 2014-11-25 |
| Coraghy, Clones, Co Monaghan | €155,000 | 2018-02-05 |
| Coraghy, Shantonagh, Castleblaney | €137,000 | 2016-12-20 |
| Corasagh, Clones, Monaghan | €100,000 | 2017-05-25 |
| Corbane, Shantonagh Po, Castleblaney | €23,220 | 2016-04-26 |
| Corbeg, Silverstream, Co. Monaghan | €328,000 | 2026-03-13 |
| Corboy, Ballybay, Co Monaghan | €114,250 | 2018-05-08 |
| Corbrack, Ballybay | €76,000 | 2015-09-03 |
| Corbyfin, Ballybay, Monaghan | €190,000 | 2023-08-03 |
| Corcaghan, Co. Monaghan | €20,000 | 2024-04-17 |
| Corcaghan, Monaghan | €67,000 | 2018-09-10 |
| Corcaghan, Stranoodon, County Monaghan | €45,000 | 2019-02-08 |
| Corconnolly, Clones, Co Monaghan | €175,000 | 2023-01-30 |
| Corconnolly, Clones, Monaghan | €352,500 | 2024-01-17 |
| Corconnolly, Scotshouse Rd, Clones | €242,000 | 2016-11-15 |
| Corconnolly, Ture, Clones | €80,000 | 2026-01-16 |
| Corcreagh, Shercock | €30,000 | 2012-05-15 |
| Corcuilloge, Carrickmacross, Co Monaghan | €56,000 | 2025-07-31 |
| Corcuilloge, Carrickmacross, Monaghan | €100,000 | 2016-08-25 |
| Corcuillogue, Carrickmacross | €90,000 | 2013-08-02 |
| Corcuillogue, Carrickmacross, Co Monaghan | €138,000 | 2024-03-28 |
| Corcuillogue, Carrickmacross, Monaghan | €379,000 | 2024-11-12 |
| Corcuillogue, Donaghmoyne Rd, Carrickmacross | €322,000 | 2018-10-05 |
| Corcullion Crew, Castleblaney, Co Monaghan | €60,000 | 2015-07-30 |
| Corcullioncrew, Cullaville, Castleblaney | €350,000 | 2022-05-06 |
| Corcullionglush, Culloville, Castleblayney | €101,000 | 2018-09-21 |
| Corcummins, Scotshouse Rd, Clones | €270,000 | 2024-12-13 |
| Cordenvlis, Castleshane, Monaghan | €380,000 | 2025-02-20 |
| Corderrybane, Castleblayney, Monaghan | €91,000 | 2023-11-07 |
| Corderryduff, Castleblayney, Co. Monaghan | €62,000 | 2024-09-11 |
| Corderryduff, Castleblayney, Monaghan | €20,000 | 2014-06-16 |
| Cordevlis, Castleshane, Monaghan | €622,000 | 2023-01-18 |
| Cordevlis, Rockcorry, Co Monaghan | €24,000 | 2024-05-24 |
| Cordoolough, Ballybay, Monaghan | €147,000 | 2021-04-30 |
| Cordrummans, Donaghmoyne, Co Monaghan | €145,000 | 2025-11-14 |
| Cordrummonds, Donaghmoyne, Carrickmacross | €80,000 | 2014-08-14 |
| Corduffkelly, Carrickmacross, Monaghan | €185,000 | 2023-10-23 |
| Coretard, Three Mile House, Monaghan | €98,018 | 2024-02-01 |
| Corglass, Rockcorry, Co Monaghan | €40,000 | 2014-07-30 |
| Corgreagh, Shercock | €36,000 | 2013-05-27 |
| Corgreagh, Shercock, County Monaghan | €40,000 | 2021-11-12 |
| Corhollan, Smithboro | €215,000 | 2010-01-13 |
| Corhollan, Smithboro, Monaghan | €135,000 | 2016-06-02 |
| Corkashybane, Carrickmacross, Co Monaghan | €395,000 | 2025-02-21 |
| Corkashybane, Laragh, Monaghan | €280,000 | 2018-02-26 |
| Corkeeran, Ballybay, County Monaghan | €115,000 | 2016-06-27 |
| Corkeeran, Newbliss, Monaghan | €70,000 | 2020-09-01 |
| Corkieran, Carrickmacross, County Monaghan | €42,000 | 2015-02-17 |
| Corkishbane, Carrickmacross, Co. Monaghan | €230,000 | 2015-06-19 |
| Corkishbane, Castleblayney, Monaghan | €125,000 | 2016-03-23 |
| Corlat, Monaghan | €346,000 | 2023-01-25 |
| Corlat, Monaghan, Co Monaghan | €262,000 | 2025-07-17 |
| Corlatt, Shantonagh, Castleblayney | €80,000 | 2023-07-05 |
| Corlatton, Three Mile House Rd, Monaghan | €270,000 | 2017-03-23 |
| Corlea, Carrickmacross | €50,000 | 2011-03-24 |
| Corlea, Lisdoonan, Carrickmacross | €75,000 | 2024-07-23 |
| Corlea, Magheracloone, Carrickmacross | €257,000 | 2022-03-30 |
| Corlea, Shantonagh, Castleblaney | €20,000 | 2022-03-25 |
| Corlea, Shantonagh, Monaghan | €260,000 | 2014-12-19 |
| Corleadaragan, Castleblayney | €458,150 | 2023-02-27 |
| Corleadargan, Castleblayney, Monaghan | €192,000 | 2016-06-22 |
| Corlealackagh, Castleblayney, Co Monaghan | €30,000 | 2020-12-02 |
| Corlealackagh, Cremartin, Castleblayney | €335,000 | 2023-10-11 |
| Corleanamaddy, Doohamlet, Monaghan | €170,000 | 2023-03-10 |
| Corleck, Aghabog, Smithboro | €160,000 | 2016-07-12 |
| Corleck, Smithborough, Co Monaghan | €325,000 | 2023-09-05 |
| Corleck, Smithborough, Monaghan | €30,000 | 2020-05-15 |
| Cormeen Lodge, Cootehill Rd, Monaghan | €70,500 | 2011-06-22 |
| Cormeen, Latton, Castleblayney | €280,000 | 2025-02-14 |
| Cormeen, Monaghan | €280,000 | 2023-12-01 |
| Cormoy Lower, Carrickmacross, Monaghan | €440,000 | 2023-10-27 |
| Cormoy, Carrickmacross, County Monaghan | €236,000 | 2016-08-05 |
| Cormoy, Carrickmacross, Monaghan | €429,000 | 2022-12-19 |
| Cormoy, Newbliss, Monaghan | €303,000 | 2022-05-23 |
| Cornacarrow, Tullynahinera, Castleblayney | €115,000 | 2014-07-24 |
| Cornacassa, Clones Rd, Monaghan | €165,000 | 2016-12-19 |
| Cornacassa, Monaghan | €215,000 | 2024-08-30 |
| Cornacassa, Monaghan, County Monaghan | €300,000 | 2023-12-06 |
| Cornacreeve, Ballybay | €160,000 | 2025-02-20 |
| Cornacreeve, Dunraymond, Monaghan | €322,500 | 2021-07-26 |
| Cornacrew, Broomfield, Castleblayney Carrickmacross | €52,000 | 2023-08-21 |
| Cornacrew, Laragh, Castleblayney | €307,000 | 2017-06-07 |
| Cornacrieve, Emyvale | €210,000 | 2010-08-30 |
| Cornacrieve, Emyvale, Co Monaghan | €281,000 | 2024-12-20 |
| Cornacrieve, Emyvale, Monaghan | €140,000 | 2023-07-21 |
| Cornagall, Broomfield, Castleblayney | €280,000 | 2022-01-14 |
| Cornagilty, Tedavnet, Co Monaghan | €260,000 | 2023-10-26 |
| Cornagilty, Tydavnet, Monaghan | €195,000 | 2025-05-28 |
| Cornahawla, Broomfield, Castleblayney | €60,000 | 2012-05-28 |
| Cornahoe Upper, Creaghanroe, Castleblaney | €80,000 | 2021-04-14 |
| Cornahoe, Castleshane, Monaghan | €40,000 | 2018-05-23 |
| Cornahoe, Tullycorbett, Ballybay | €106,000 | 2013-07-03 |
| Cornalaragh, Carrickmacross | €160,000 | 2013-06-19 |
| Cornamucklagh, Broomfield, Castleblayney | €150,000 | 2019-08-08 |
| Cornamucklaglass, Ballybay, Monaghan | €45,000 | 2020-06-25 |
| Cornamundy, Cootehill Rd, Monaghan | €220,000 | 2018-10-16 |
| Cornamundy, Monaghan | €275,000 | 2022-11-24 |
| Cornanure, Ballybay | €75,000 | 2012-11-06 |
| Cornanure, Broomfield, Castleblayney | €141,000 | 2014-03-10 |
| Cornasassanagh, Shantonagh, Castleblayney | €130,000 | 2017-02-07 |
| Cornatain, Broomfield, Castleblayney | €175,000 | 2019-03-22 |
| Cornawall, Smithborough, Monaghan | €450,000 | 2024-08-23 |
| Cornawall, Threemilehouse | €136,564 | 2011-09-30 |
| Cornenty, Shantonagh Po, Castleblayney | €45,000 | 2018-11-26 |
| Corness, Monaghan, County Monaghan | €50,000 | 2016-10-12 |
| Corngall, Broomfield, Castleblayney | €70,000 | 2013-03-11 |
| Corr An Tobair, 8 Tobar An Radhairc, Ballybay Rd | €305,000 | 2018-09-07 |
| Corrach, Shantonagh, Castleblaney | €310,000 | 2023-09-08 |
| Corracken, Scotshouse, County Monaghan | €70,000 | 2017-08-31 |
| Corracloghan House, Corracloghan, Castleblayney | €310,000 | 2026-02-24 |
| Corracloghan, Castleblayney | €105,000 | 2011-10-03 |
| Corracloughan, Castleblayney, Monaghan | €215,000 | 2019-11-15 |
| Corragarry, Castleblaney, Co Monaghan | €179,000 | 2016-05-12 |
| Corragarry, Castleblayney | €380,000 | 2010-10-13 |
| Corragarry, Drum, Monaghan | €95,000 | 2015-04-17 |
| Corragharra, Sherlock P O, Cavan | €212,000 | 2023-10-26 |
| Corraghmaxwell, Glaslough, Co Monaghan | €22,000 | 2017-08-09 |
| Corraharra, Shantonagh, Monaghan | €295,000 | 2022-12-13 |
| Corramegan, Newbliss | €82,000 | 2011-12-01 |
| Corramegan, Newbliss, Monaghan | €286,000 | 2025-10-02 |
| Corraskeagh, Shercock, County Monaghan | €185,000 | 2023-08-15 |
| Corratanty, Castleblayney, Monaghan | €121,000 | 2018-10-05 |
| Corrawillan, Castleshane, Monaghan | €240,000 | 2018-06-22 |
| Correvan, Newbliss, Co Monaghan | €50,000 | 2026-02-27 |
| Corrineary, Drum, Monaghan | €245,000 | 2025-10-22 |
| Corrinenty, Castleblayney, Co. Monaghan | €26,250 | 2019-11-07 |
| Corrinshigagh, Broomfield, Castleblaney | €337,500 | 2019-12-05 |
| Corrinshigagh, Carrickmacross, Monaghan | €335,000 | 2022-07-14 |
| Corrinshigo, Carrickmacross, Co Monaghan | €75,000 | 2022-11-02 |
| Corrinshigo, Carrickmacross, Monaghan | €170,000 | 2023-09-29 |
| Corrinshigo, Drum | €150,000 | 2013-03-08 |
| Corrinshigo, Smithboro | €167,000 | 2012-06-12 |
| Corryarabeg, Carrickroe, Co Monaghan | €95,000 | 2017-06-19 |
| Corrybracken, Carrickmacross, Monaghan | €220,000 | 2024-12-16 |
| Corrybrannan, Ballybay | €65,000 | 2010-07-28 |
| Corrybrennan, Ballybay | €35,000 | 2013-10-04 |
| Corrybrennan, Ballybay, Monaghan | €380,000 | 2025-12-08 |
| Corrygarry, Castleblaney, Co Monaghan | €234,000 | 2024-02-07 |
| Corrygarry, Castleblaney, Monaghan | €154,000 | 2025-10-31 |
| Corrygarry, Castleblayney, Co Monaghan | €245,000 | 2023-07-14 |
| Corrygarry, Castleblayney, Monaghan | €80,000 | 2026-03-13 |
| Corryloan, Doohamlet, Castleblayney | €51,000 | 2018-10-31 |
| Cortober, Drum, Monaghan | €100,000 | 2024-01-10 |
| Cortubber, Castleblaney, Shantonagh | €35,000 | 2022-11-08 |
| Corvalley, Braddox, Monaghan | €60,000 | 2017-12-18 |
| Corvalley, Silverstream, Monaghan | €160,000 | 2021-02-24 |
| Corvally, Carrickmacross | €165,000 | 2010-12-17 |
| Corvally, Glaslough | €174,308 | 2012-06-14 |
| Corvilla, Aghabog, Monaghan | €100,000 | 2022-01-25 |
| Corvoy, Ballybay, County Monaghan | €30,000 | 2024-05-29 |
| Corwillan, Ballybay | €135,000 | 2021-01-08 |
| Corwillan, Ballybay, Monaghan | €269,000 | 2022-11-24 |
| Corwillan, Latton, Castleblayney | €270,000 | 2026-03-13 |
| Corwillian, Castleshane, Monaghan | €310,000 | 2024-09-23 |
| Cottage House, Dizum, Monaghan | €85,000 | 2016-12-02 |
| Cottage, Lattonfasky Tullynahinera, Castleblaney | €183,000 | 2018-02-14 |
| Cranmor, Carrickmacross, Co Monaghon | €300,000 | 2022-09-05 |
| Creagh, Threemilehouse, Monaghan | €20,000 | 2017-08-31 |
| Creesil, Tydavnet, Monaghan | €360,000 | 2026-08-13 |
| Creevagh, Ballybay, Co Monaghan | €65,000 | 2019-05-08 |
| Creevaghy, Clones, Monaghan | €30,000 | 2015-01-05 |
| Creeve, Aughnamullen, Castleblayney | €160,000 | 2022-02-21 |
| Creeve, Latton Po, Castleblaney | €60,000 | 2024-12-03 |
| Creevy, Carrickmacross | €500,000 | 2025-08-27 |
| Creevy, Carrickmacross, County Monaghan | €100,000 | 2023-03-14 |
| Creevy, Carrickmacross, Monaghan | €900,000 | 2026-09-03 |
| Creevy, Swinburne, Carrickmacross | €110,000 | 2018-02-23 |
| Creevyoliver, Carrickmacross, Monaghan | €340,000 | 2021-06-11 |
| Cremartin Rd, Lislanley, Castleblayney | €415,000 | 2026-01-29 |
| Cremartin, Castleblaney | €88,106 | 2013-12-19 |
| Cremhrtin, Castleblayney, Monaghan | €90,000 | 2024-06-20 |
| Cremoyle, Swanns Cross | €25,000 | 2010-08-03 |
| Crescent Bungalow, Analore Road, Clones | €90,000 | 2016-01-13 |
| Crinkill And Toome, Doohamlet | €125,000 | 2010-01-19 |
| Crinkill, Doohamlet, Castleblayney | €102,000 | 2020-10-01 |
| Croghan, Annyalla, Castleblayney | €52,000 | 2015-03-05 |
| Crossaghy, Clontibret | €74,890 | 2015-01-29 |
| Crossalare, Laragh, Castleblayney | €475,000 | 2025-09-11 |