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| (C) | Close (Boulders) |
| C | Cam, Canal, Causeway, Centre of, Channel, Cliff, Conduit, Cop, Course of, Covered, Culvert, Cut |
| C | Carriage, Creek, Cross |
| C | Causeway, Chase, Circle, Circus, Close, Corner, Court, Crescent, Croft, Cross, Cut |
| C | Cock |
| C | Community (Wales) |
| C | Coniferous |
| C | Crane |
| C in W | Church in Wales |
| C of E | Church of England |
| C of S | Church of Scotland |
| Caern | Caernarvonshire |
| Caithness | Caithness |
| Calv | Calvinist |
| Cambs | Cambridgeshire |
| Car Pk | Car Park |
| Card | Cardiganshire |
| Carm | Carmarthenshire |
| Cas | Castle |
| CAS | Castle |
| CATH | Cathederal |
| Cath | Cathedral |
| Cathl | Cathedral |
| CB | Centre of Bank, Basin, Baulk, Broad |
| CB | Coal Bin |
| CB | County Borough |
| CC | Centre of Canal |
| CC | Chisel Cut (Mark) |
| CC | Coal Cover? |
| CC | County Constituency |
| CC | County Council |
| CCLW | Centre of Channel at Low Water |
| CCS | Centre of Covered Stream |
| CD | Centre Drain |
| CD | Centre of Drain |
| CDK | Centre Drain at Kerb |
| CDS | Cul de sac (Station) |
| Cemy | Cemetery |
| Cen | Centre (Social, etc) |
| CF | Croft |
| CFT | Croft |
| CG | Cattle Grid |
| CG Lookout | Coastguard Lookout |
| CG Sta | Coastguard Station |
| CH | Chase |
| Ch | Church |
| CH | Club House |
| CH | Coach House |
| CH | Coach House |
| CH | Coal House |
| Ch Yd | Church Yard |
| CHA | Chase |
| Chap | Chapel |
| Ches | Cheshire |
| Chr Sc Ch | Christian Science Church; Church of Christ Scientist |
| Chy | Chimney |
| Cin | Cinema |
| CIR | Circle, Circus |
| CIRC | Circle, Circus |
| Cis | Cistern |
| CL | Close |
| CL | Close [density] |
| Cl | Close [place] |
| Clackmannan | Clackmannanshire |
| CB | Coal Bin |
| Cleve | Cleveland |
| Cl H | Coal House |
| CLUB HO | Club House |
| Clwyd | Clwyd |
| CM | Chalk/Crayon Mark |
| Cn | Capstan |
| CN | Cistern |
| Cnl | Council (not in conjunction with county) |
| CNR | Corner |
| Cnr | Corner |
| Co Cnl | County Council |
| Co Const | County Constituency |
| Co of City | County of City |
| Co-ed | Co-educational |
| Co-ord(s) | Co-ordinate(s) |
| COCS | Centre of old course of stream |
| CoH | Cow House |
| Col | Collects |
| Coll | College |
| Colly | Colliery |
| Comm Centre | Community Centre |
| Comps | Computations |
| Conc | Concrete |
| Congl | Congregational |
| Conv Home | Convalescent Home |
| Cop | Coppice |
| Corn | Cornwall |
| Corpn | Corporation |
| Corpn Yd | Corporation Yard |
| Cott | Cottage |
| CP | Centre Punched (Mark) |
| CP | Cess Pool |
| CP | Civil Parish |
| CPA | Comparator Point (Air) |
| CPG | Comparator Point (Ground) |
| Cr | Centre [of stone marking triangulation point] |
| CR | Centre of Railway, River, Road |
| CR | Continuous Revison |
| Cr | Crescent |
| CR | Crescent |
| cr | Crosses |
| Crem | Crematorium |
| Cres | Crescent |
| CRES | Crescent |
| CRT | ? |
| CS | Centre of Stream |
| CS | Cess Pool |
| CS | Cross |
| Cse | Course |
| CSWY | Causeway |
| CT | Cart Track |
| Ct | Court |
| CT | Court |
| CT H | Cart House |
| CT S | Cart Shed |
| CU | Classification unchanged |
| CU | Cut |
| Cul | Culvert |
| Cumb | Cumberland |
| Cumbr | Cumbria |
| Cvt | Convent |
| CW | Causeway |
| CW | Centre of Wall |
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