| Caislean Riada, Coosan | — | 8 |
| Carberry House, Ardri | — | 6 |
| Carnagh House, Ardri | €202,000 | 12 |
| Carnfyan, Mount Temple | — | 5 |
| Carra Vale, Ballymahon Rd | — | 7 |
| Carra Vale, Mullingar | — | 8 |
| Carraig Mhor, Clonmellon | — | 11 |
| Carrick, Dalystown | — | 5 |
| Cartron Drive, Athlone | €217,500 | 23 |
| Cartron Grange, Moate | — | 5 |
| Cartrontroy, Athlone | — | 5 |
| Cartrontroy Heights, Athlone | — | 7 |
| Cartrontroy Heights, Dublin Road | — | 6 |
| Castle Court, Castlepollard | — | 5 |
| Castle Heights, Castlepollard | — | 5 |
| Castle View, Delvin | — | 10 |
| Castle View Court, Delvin | €224,000 | 17 |
| Castledown, The Downs | — | 5 |
| Castlegrove, Castlepollard | — | 6 |
| Castlelost, Rochfortbridge | — | 8 |
| Castlelost Vale, Rochfortbridge | €200,000 | 16 |
| Castletown, Delvin | €207,000 | 12 |
| Castletown Green, Athboy Road | — | 6 |
| Castleview, Delvin | — | 11 |
| Castleview Court, Delvin | — | 10 |
| Cathedral View, Mullingar | €140,000 | 18 |
| Catherinestown, Gaybrook | €300,000 | 5 |
| Central Park, Mullingar | €360,000 | 11 |
| Chapel St, Athlone | — | 5 |
| Chestnut Close, Royal Canal | €209,251 | 30 |
| Chestnut Drive, Mullingar | €225,000 | 36 |
| Chestnut Grove, Mullingar | €323,000 | 13 |
| Church Hills Crescent, Coosan | €265,000 | 11 |
| Church Hills Road, Coosan | €300,000 | 30 |
| Church Lane, Moate | €159,500 | 18 |
| Church St, Castlepollard | — | 6 |
| Church Street, Moate | — | 5 |
| Church View, Bastion Court | €185,000 | 23 |
| Church View, Main St | — | 7 |
| Church Walk, Bastion Court | — | 7 |
| Churchfields, Coosan | — | 8 |
| Churchwood, Coosan | €330,000 | 19 |
| Cionn, Castlepollard | — | 5 |
| Cionn Torc, Castlepollard | — | 8 |
| Clara Road, Moate | €110,000 | 19 |
| Clibborne Way, Moate | €247,000 | 14 |
| Clog Na Leinn, Collinstown | €405,286 | 57 |
| Cloghanboy Ave, Ballymahon Rd | — | 6 |
| Cloghanboy Crescent, Athlone | — | 5 |
| Cloghanboy Park, Athlone | — | 5 |
| Clonbonny, Athlone | — | 10 |
| Clonbrusk, Athlone | — | 6 |
| Clonbrusk, Ballymahon Road | €306,750 | 10 |
| Cloneyegan, Mount Temple | — | 5 |
| Clonlost, Killucan | €355,000 | 11 |
| Clonmore Heights, Mullingar | €243,000 | 32 |
| Clonyn, Delvin | — | 6 |
| Cloon Lara, Athlone Road | €264,000 | 14 |
| Cloon Lara, Mullingar | €278,500 | 20 |
| Cloonagh, Ballinagore | — | 8 |
| Cloonlara, Athlone Road | — | 16 |
| Cloonlara, Mullingar | — | 7 |
| Clos An Blinn, Kinnegad | €180,000 | 14 |
| Cluain Craoibh, Kinnegad | €250,000 | 39 |
| Cluain Mhor, Clonmellon | — | 7 |
| Cluain Milain, Clonmellon | — | 8 |
| Cluain Mullan, Castlepollard | — | 14 |
| Cluain Mullan, Green Street | — | 15 |
| Coill Rua, Ballymahon Road | — | 12 |
| Coill Rua, Greenpark West | €270,500 | 22 |
| Coill Rua, Mullingar | €270,500 | 47 |
| Cois Abhainn, Multyfarnham | €450,000 | 12 |
| Cois Abhann, Excise Street/Lyster Street | — | 14 |
| Cois Caislean, Delvin | — | 5 |
| Cois na hAbhainn, Moate | €252,000 | 10 |
| Cois na hAbhainn, Station Road | €240,000 | 22 |
| Cois Na Habhann, Station Rd | — | 7 |
| Coislene, Collinstown | — | 6 |
| College Court, College St | — | 6 |
| College Hill, Irishtown | €284,000 | 21 |
| College Hill, Mullingar | €347,000 | 59 |
| college park, athlone | — | 7 |
| College Vale, Mullingar | — | 15 |
| Connaught Street, Athlone | €145,000 | 18 |
| Connaught Street, Bastion Court | €167,500 | 12 |
| Connolly Street, Athlone | €165,000 | 12 |
| Convent Court, Church St | — | 5 |
| Convent Court, Moate | — | 7 |
| Coole, Mullingar | — | 6 |
| Coolevin Park, Coosan | €300,000 | 19 |
| Coosan, Athlone | — | 14 |
| Coosan Road, Athlone | — | 5 |
| Coralstown, Mullingar | — | 8 |
| Corbetstown, Killucan | €365,000 | 10 |
| Corcloon, Milltownpass | — | 5 |
| Cornamaddy, Athlone | — | 12 |
| Cornamaddy Avenue, Cornamaddy | €321,586 | 11 |
| Cornamaddy Avenue, Drumaconn | — | 6 |
| Cornamaddy Court, Cornamaddy | €352,422 | 28 |
| Cornamaddy Drive, Gracefields | €339,207 | 20 |
| Cornamaddy Green, Cornamaddy | €325,991 | 9 |
| Cornamaddy Grove, Gracefields | €348,018 | 7 |
| Cornamaddy Way, Gracefields | €348,018 | 12 |
| Cornamagh, Athlone | — | 9 |
| Corrydonlon, Rathowen | — | 6 |
| Court Devenish, Athlone | — | 9 |
| Craddenstown, Raharney | €345,000 | 22 |
| Crofton Court, Moate | — | 6 |
| Croi Oige, Athlone | — | 8 |
| Croi Oige, Dublin Road | €137,000 | 19 |
| Crowenstown, Delvin | — | 7 |
| crystal village, athlone | — | 5 |
| Crystal Village, Bonavalley | — | 5 |
| Cuan Mhuire, Belvedere Hills | €197,000 | 10 |
| Cuirt an Rath Ainin, Dublin Road | €133,689 | 11 |
| Culleendarragh, Multyfarnham | — | 5 |
| Cullionbeg, Mullingar | — | 8 |
| Cummerstown, Collinstown | — | 9 |
| Curraghmore, Mullingar | — | 7 |
| Custume Pier, Athlone | — | 7 |
| Cypress Gardens, Athlone | €244,000 | 24 |
| The Cedars, Lakepoint | — | 16 |
| The Close, Lakepoint | €335,000 | 10 |
| The Close, Lakepoint Park | €270,000 | 23 |
| The Court, Lakepoint | — | 5 |
| The Court, Lakepoint Park | €296,000 | 9 |
| The Court, Market Point | €160,000 | 9 |
| The Crescent, Lakepoint | — | 10 |
| The Crescent, Lakepoint Park | €306,500 | 17 |