There are 18 postcodes in the built up area of Caergeiliog. The area contains approximately 180 households with a population of about 408 (2011 census)
Active postcode
Postcode no longer in use| Postcode | Latitude | Longitude | Easting | Northing | Grid reference | Active? |
|---|---|---|---|---|---|---|
| LL65 3FH | 53.278215 | -4.539504 | 230779 | 378702 | SH307787 | Yes |
| LL65 3HN | 53.276178 | -4.543958 | 230474 | 378486 | SH304784 | Yes |
| LL65 3HP | 53.277461 | -4.543659 | 230499 | 378628 | SH304786 | Yes |
| LL65 3HS | 53.276448 | -4.542684 | 230560 | 378513 | SH305785 | Yes |
| LL65 3HU | 53.276825 | -4.543096 | 230534 | 378556 | SH305785 | Yes |
| LL65 3HW | 53.277069 | -4.543906 | 230481 | 378585 | SH304785 | Yes |
| LL65 3NH | 53.273846 | -4.530575 | 231357 | 378195 | SH313781 | No |
| LL65 3NN | 53.27274 | -4.528439 | 231495 | 378067 | SH314780 | Yes |
| LL65 3NP | 53.274484 | -4.531017 | 231330 | 378267 | SH313782 | Yes |
| LL65 3PJ | 53.276169 | -4.538872 | 230813 | 378473 | SH308784 | Yes |
| LL65 3PQ | 53.275143 | -4.536801 | 230947 | 378354 | SH309783 | Yes |
| LL65 3YA | 53.276968 | -4.541455 | 230644 | 378568 | SH306785 | Yes |
| LL65 3YB | 53.277734 | -4.540525 | 230709 | 378651 | SH307786 | Yes |
| LL65 3YD | 53.276646 | -4.540536 | 230704 | 378530 | SH307785 | Yes |
| LL65 3YE | 53.277604 | -4.535267 | 231059 | 378624 | SH310786 | Yes |
| LL65 3YF | 53.27551 | -4.534798 | 231082 | 378390 | SH310783 | Yes |
| LL65 3YG | 53.275184 | -4.534479 | 231102 | 378353 | SH311783 | Yes |
| LL65 3YH | 53.274783 | -4.533465 | 231168 | 378306 | SH311783 | Yes |