| Clonsast, Rathangan, Offaly | €235,000 | 2023-03-28 |
| Clonshanny, Clara | €65,000 | 2012-07-11 |
| Clonshanny, Clara, Co Offaly | €140,000 | 2025-05-08 |
| Clonygowan, Offaly | €152,500 | 2015-04-22 |
| Clonygowan, Tullamore, Co Offaly | €140,000 | 2021-11-29 |
| Cloonagh West, Tullamore, Offaly | €255,000 | 2017-09-15 |
| Cloonagh, Daingean, Offaly | €330,000 | 2023-12-18 |
| Cloonagh, Tullamore, Co. Offaly | €175,000 | 2018-10-26 |
| Cloonagh, Tullamore, Offaly | €405,000 | 2024-07-29 |
| Cloonaloughan, Cloughjordan | €105,000 | 2010-03-03 |
| Clooneen, Rhode, Co. Offaly | €188,000 | 2022-01-06 |
| Cloonfad, Roosky, Co. Roscommon | €100,000 | 2024-07-12 |
| Cloughal Beg, Belmont, Birr | €70,000 | 2026-08-31 |
| Cloughatanny, Clara, Co Offaly | €35,000 | 2026-06-08 |
| Cloughjordan Road, Moneygall, Co Offaly | €123,950 | 2022-01-10 |
| Cloughmore Shannon Harbour, Birr, Offaly | €250,000 | 2016-02-12 |
| Cloughmoyle Castle, Shinrone, Birr | €265,000 | 2019-03-12 |
| Cloughmoyle, Shinrone, Birr | €215,000 | 2024-12-20 |
| Cloughtaney, Clara | €100,000 | 2012-01-24 |
| Clyduff, Rhode, Offaly | €65,000 | 2015-02-03 |
| Cnoc Beag, Dromakeenan, Roscrea | €196,000 | 2017-11-07 |
| Coagh Upper, Eglish, Birr | €280,000 | 2018-11-29 |
| Coagh, Killyon, Birr | €190,000 | 2019-11-01 |
| Cogran, Lusmagh, Banagher | €275,000 | 2025-09-11 |
| Cois Abhainn, Riverside, Birr | €350,000 | 2026-07-23 |
| Cokery Lane, Monasteroris, Edenderry | €267,500 | 2024-03-06 |
| Coldblow, Shinrone, Birr | €115,000 | 2019-09-17 |
| Colehill, Tullamore, Offaly | €240,000 | 2026-07-23 |
| Coleraine, Kildangan, Tullamore | €175,000 | 2019-06-06 |
| Coleraine, Tullamore, County Offaly | €140,000 | 2022-07-08 |
| Collisons, Lower Main St, Moneygall | €66,500 | 2015-03-09 |
| Colonel Perry St, Edenderry, Offaly | €350,000 | 2020-07-09 |
| Colperry Street, Edenderry, Co Offaly | €160,000 | 2024-08-23 |
| Conbarry House, Arden Heights, Tullamore | €330,000 | 2017-11-15 |
| Conicker Lane, Conicker, Roscrea | €300,000 | 2023-09-20 |
| Coniker Durrow, Tullamore, Durrow | €237,500 | 2023-09-14 |
| Coniker Durrow, Tullamore, Offaly | €167,000 | 2014-10-10 |
| Coniker, Durrow, Tullamore | €200,000 | 2023-10-02 |
| Connail, Clara Road, Tullamore | €315,000 | 2026-05-07 |
| Connaught St, Birr, Offaly | €125,000 | 2022-07-20 |
| Connaught Street, Birr, Co. Offaly | €140,000 | 2023-07-28 |
| Connaught Street, Birr, County Offaly | €353,000 | 2025-10-31 |
| Conroys Cottage, Graigue Killeigh, Tullamore | €155,000 | 2023-03-02 |
| Convent Of Mercy, Kilcormac, Co Offaly | €300,000 | 2020-09-28 |
| Convent Rd, Tullamore, Offaly | €15,000 | 2019-05-08 |
| Coolacrease, Cadamstown, Birr | €260,000 | 2020-07-03 |
| Coolagarry, Walsh Island, Geashill | €141,000 | 2017-12-21 |
| Coolagarry, Walsh Island, Tullamore | €280,000 | 2026-06-11 |
| Coolagh Lane, Garrymore, Geashill | €325,000 | 2020-01-24 |
| Coolagh, Kilcavan, Geashill Tullamore | €99,000 | 2015-08-18 |
| Coolanarney, Blueball, Tullamore | €379,000 | 2023-05-12 |
| Coolcor, Rhode | €70,000 | 2011-04-04 |
| Coolcor, Rhode, Co Offaly | €40,000 | 2016-07-26 |
| Coolcor, Rhode, Offaly | €140,000 | 2023-09-12 |
| Coolcur, Rhode, Offaly | €305,000 | 2021-10-15 |
| Cooldarragh Glebe, Tullamore | €45,000 | 2012-08-28 |
| Coolderry, Banagher, Co Offaly | €95,000 | 2014-08-27 |
| Coolderry, Birr, Offaly | €128,000 | 2021-07-22 |
| Coolderry, Brosna, Birr | €45,000 | 2015-02-24 |
| Cooldorough, Ballinahown, Athlone | €80,000 | 2017-07-26 |
| Cooldorough, Doon, Offaly | €111,375 | 2020-06-04 |
| Cooldorragh Glebe, Mountbolus, County Offaly | €295,000 | 2024-04-05 |
| Cooldorragh, Blueball, Tullamore | €250,000 | 2020-04-30 |
| Coole Rd Ferbane, Ferbane, Offaly | €175,000 | 2015-10-02 |
| Coole, Croghan, Rhode | €35,000 | 2022-11-30 |
| Coole, Ferbane, Offaly | €215,000 | 2020-11-16 |
| Coole, Killyon, Birr | €50,000 | 2021-05-17 |
| Coole, Rhode, Co Offaly | €270,000 | 2022-10-18 |
| Coole, Rhode, Offaly | €137,000 | 2016-05-06 |
| Coolea, Ballyvora, Athlone Rd | €161,250 | 2025-01-02 |
| Coolfin, Banagher, Offaly | €300,000 | 2022-05-27 |
| Coolfin, Kilcormac, Co Offaly | €60,000 | 2026-06-19 |
| Coolfin, Kilcormac, Offaly | €175,000 | 2026-07-09 |
| Coolnahiley, Tullamore | €23,225 | 2010-11-16 |
| Coolnahiney, Tullamore, Co Offaly | €206,250 | 2025-04-17 |
| Coologue, Daingean, Tullamore | €90,000 | 2016-06-24 |
| Coolreagh, Cloghan, Birr | €300,000 | 2016-12-14 |
| Coolygagan, Clonbulloge, Co. Offaly | €220,000 | 2025-10-10 |
| Coooagary, Walsh Island, Geashill | €148,000 | 2021-02-05 |
| Cooraclayin, Barna, Shinrone | €60,000 | 2023-09-06 |
| Cooraclevin, Dunkerrin, Birr | €165,000 | 2022-07-22 |
| Coppice, Clonminch, Tullamore | €150,000 | 2020-12-07 |
| Cor More, Ballinahown, Athlone | €155,000 | 2017-08-17 |
| Corbane, Endrim, Ferbane | €197,500 | 2020-02-10 |
| Corbane, Ferbane, County Offaly | €30,000 | 2026-02-25 |
| Corbetstown, Castlejordan, Rhode | €30,000 | 2014-03-24 |
| Corbetstown, Castlejordan, Tullamore | €110,000 | 2019-07-10 |
| Corbetstown, Castlejordan, Via Tullamore | €363,000 | 2023-05-05 |
| Corbetstown, Rhode, Offaly | €392,500 | 2024-08-29 |
| Corcullen Ballinahown, Athlone, Co Westmeath | €195,000 | 2019-03-29 |
| Corgrave South, Lusmagh, Banagher | €225,000 | 2023-05-16 |
| Cork Hill, Clara | €138,000 | 2010-03-18 |
| Cork Hill, Clara, Offaly | €250,000 | 2025-12-09 |
| Corkhill House, Corkhill, Clara | €530,000 | 2019-01-09 |
| Corkhill, Clara, Co Offaly | €200,000 | 2020-11-20 |
| Corlanty, Shinrone, Offaly | €55,000 | 2023-12-07 |
| Cormac House, Mountrath St, Kilcormac | €145,000 | 2021-12-01 |
| Cormac St, Tullamore, Offaly | €210,000 | 2022-10-26 |
| Cormac Street, Tullamore | €300,000 | 2012-10-25 |
| Cormac Street, Tullamore, Co. Offaly | €160,000 | 2025-03-12 |
| Cornafurnish, Leabeg, Ballycumber | €200,000 | 2018-03-20 |
| Cornafurrish, Ballycumber, Offaly | €215,500 | 2023-11-09 |
| Cornagark, Kilcormac | €50,000 | 2010-05-11 |
| Cornalaur, Rahan, Tullamore | €85,000 | 2018-01-24 |
| Corndarragh, Ballydaly, Tullamore | €215,000 | 2020-11-20 |
| Corner House, Main St, Moneygall | €150,000 | 2026-09-09 |
| Cornhill, Riverstown, Birr | €100,000 | 2024-03-19 |
| Corolanty, Shinrone, Birr | €159,000 | 2020-09-07 |
| Corr Hill, Doon, Ferbane | €26,000 | 2019-03-08 |
| Corraclevin, Barna Dunkerrin, Birr | €50,000 | 2013-08-09 |
| Corraclevin, Dunkerrin, Birr | €282,000 | 2024-09-25 |
| Corrhill, Ballinahown, Athlone | €300,000 | 2018-01-23 |
| Corrigeen, Mountbolus, Offaly | €335,000 | 2021-08-23 |
| Cottage Crainnte, Upper Killurin, Blueball | €220,000 | 2019-02-25 |
| Cottage, Derrybeg, Tullamore | €30,000 | 2019-12-05 |
| Covert, Clonminch Road, Tullamore | €190,000 | 2020-12-07 |
| Crank Rd, Lusmagh, Banagher | €96,500 | 2020-02-14 |
| Crank Road, Banagher, Co. Offaly | €100,000 | 2026-08-11 |
| Credit Union, Main St, Shinrone | €60,000 | 2020-12-21 |
| Creevagh, Clonmacnoise, Offaly | €205,000 | 2019-07-05 |
| Creggan, Cloghan, Offaly | €164,000 | 2016-06-02 |
| Crinkle, Birr, Offaly | €250,000 | 2021-12-21 |
| Croghan Rd, Birr, Offaly | €165,000 | 2017-08-24 |
| Croghan, Birr, Offaly | €295,000 | 2015-12-18 |
| Croghan, Rhode, Offaly | €455,000 | 2021-11-29 |
| Crumlin Big, Moneygall, Birr | €340,000 | 2023-09-04 |
| Cuba Ave, Banagher, Offaly | €298,000 | 2025-10-29 |
| Cuba Avenue, Banagher | €80,000 | 2012-12-20 |
| Cuba Cottages, Harbour Rd, Banagher | €75,000 | 2025-01-17 |
| Cuba Lodge, Banagher, Offaly | €250,000 | 2020-10-02 |
| Cullenwaine, Cloughjordan, Tipperary | €68,000 | 2017-08-11 |
| Cully, Blueball, Tullamore | €90,000 | 2018-12-13 |
| Cultree, Broughall, Kilcormac | €130,000 | 2024-07-31 |
| Cumber, Kinnity, Birr | €280,000 | 2023-10-13 |
| Cunninghams, Ballinagar, Offaly | €95,000 | 2017-06-30 |
| Curragh Down, Ballyclare, Ferbane | €140,000 | 2025-12-02 |
| Curragh Hill, Geashill, Offaly | €235,000 | 2024-03-28 |
| Curragh Lower, Geahill, Tullamore | €175,000 | 2020-08-24 |
| Curragh Lower, Kilcormac, Offaly | €193,000 | 2020-07-03 |
| Curragh Rd, Clara, Offaly | €295,000 | 2023-11-03 |
| Curragh View House, Ballingar, Offaly | €460,000 | 2025-06-19 |
| Curragh, Coolderry, Birr | €300,000 | 2022-08-18 |
| Curragh, Geashill, Tullamore | €50,000 | 2016-09-29 |
| Curraghavarna, Banagher, Co Offaly | €90,000 | 2021-11-04 |
| Curraghavarna, Banagher, Offaly | €180,000 | 2023-11-06 |
| Curraghdown, Ballyclare, Ferbane | €170,000 | 2021-02-24 |
| Curraghlassa, Ferbane, Offaly | €45,000 | 2023-10-05 |
| Curraghmeelagh, Blueball, Tullamore | €125,000 | 2022-08-18 |
| Curraghmore, Kilcormac, Offaly | €75,000 | 2019-10-04 |
| Curraghroe, Killane, Edenderry | €320,000 | 2021-12-13 |
| Curraghvarna, Banagher, Co. Offaly | €120,000 | 2018-03-02 |
| Curry Gurry, Blueball, Tullamore | €100,000 | 2021-12-07 |
| Cush, Pullough, Tullamore | €210,000 | 2017-08-25 |
| Cush, Rahan, Tullamore | €165,000 | 2023-01-20 |
| Cushcallow, Banagher, County Offaly | €10,000 | 2024-11-18 |
| Cushcallow, Banagher, Offaly | €34,000 | 2014-03-18 |
| Cushcallow, Harbour Rd, Banagher | €270,000 | 2024-11-26 |
| Cushina Lodge, Cushina, Portarlington | €137,000 | 2015-01-06 |
| Cushina, Porarlington, Co Offaly | €540,000 | 2021-12-20 |
| Cushina, Portarlington | €270,000 | 2015-06-05 |
| Cushina, Portarlington, Co Offaly | €270,000 | 2023-08-04 |
| Cushina, Portarlington, County Offaly | €70,000 | 2020-08-14 |
| Cushina, Portarlington, Offaly | €390,000 | 2024-08-02 |
| Daingean Rd, Tullamore, Offaly | €405,000 | 2022-06-03 |
| Daingean Road, Tullamore, Co Offaly | €300,000 | 2025-12-18 |
| Dair House, Treascon, Portarlington | €340,000 | 2024-12-12 |
| Dairy Cottage, Boora, Tullamore | €24,000 | 2013-07-03 |
| Dalgan, Geashill | €105,000 | 2010-10-29 |
| Dalgan, Geashill, Tullamore | €130,000 | 2022-03-09 |
| Dalriada, 92 The Green, Clara | €96,000 | 2021-07-14 |
| Dalston, Clara Rd, Tullamore | €15,000 | 2022-03-07 |
| Dalziel House, Brackagh, Horseleap | €260,000 | 2020-07-20 |
| Danganbeg, Killeigh, Tullamore | €480,000 | 2023-05-26 |
| Davitt House, Puttaghaun, Tullamore | €220,000 | 2014-08-08 |
| De Currah, Cadamstown, Kinnitty | €195,000 | 2018-05-11 |
| Deer Park, Belmont | €225,000 | 2012-03-30 |
| Deer Park, Belmont, Offaly | €20,000 | 2018-12-30 |
| Deerpark Lodge, Moystown, Belmont | €325,000 | 2022-11-04 |
| Deerpark, Croghan, Rhode | €120,000 | 2019-11-08 |
| Deerpark, Moystown, Birr | €140,000 | 2017-09-15 |
| Denene, New Rd, Tullamore | €195,000 | 2015-09-09 |
| Dermagun, Ballycumber, Offaly | €130,000 | 2022-09-19 |
| Dernagun, Ballycumber, Co Offaly | €16,750 | 2024-11-14 |
| Derreen, Cloneydowan, Tullamore | €48,000 | 2018-11-01 |
| Derreen, Clonygowan, Tullamore | €250,000 | 2024-05-29 |
| Derricamore, Ferbane, Offaly | €210,000 | 2024-01-24 |
| Derries, Edenderry, Co Offaly | €130,000 | 2026-01-27 |
| Derrinboy, Kilcormac, Co. Offaly | €310,000 | 2019-12-11 |
| Derrinboy, Kilcormac, County Offaly | €55,000 | 2016-10-18 |
| Derrinboy, Kilcormac, Offaly | €305,000 | 2021-09-24 |
| Derrinclare, Cloughjordan, Tipperary | €210,000 | 2016-04-28 |
| Derrinclare, Shinrone | €210,000 | 2013-10-23 |
| Derrinclare, Shinrone, Birr | €283,000 | 2023-08-17 |
| Derrinclare, Shinrone, Offaly | €252,000 | 2025-10-29 |
| Derrinduff, Birr | €240,000 | 2013-07-08 |
| Derrinduff, Birr, Co Offaly | €70,000 | 2020-12-14 |
| Derrinduff, Birr, Offaly | €257,500 | 2013-12-20 |
| Derrinlough, Birr | €39,000 | 2010-03-18 |
| Derrinlough, Fivealley, Birr | €100,000 | 2018-10-12 |
| Derrinsallagh, Birr, Offaly | €157,000 | 2017-11-23 |