CF3 postcode district
CF3 holds 922 live postcodes around Marshfield, in Cardiff, Newport, Caerphilly.
Towns and villages with their centre in CF3
| # | Place | County / council | Population |
|---|---|---|---|
| 1 | Marshfield | Newport | 3,054 |
Wards
| Name | Share of postcodes |
|---|---|
| Trowbridge | 34% |
| Llanrumney | 25% |
| Rumney | 22% |
| Pontprennau and Old St Mellons | 11% |
| Tredegar Park and Marshfield | 9% |
| Machen and Rudry | 0% |
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Cardiff East | 80% |
| Cardiff North | 11% |
| Newport West and Islwyn | 9% |
| Caerphilly | 0% |
Deprivation
The middle postcode here sits in decile 3 of the Welsh Index of Multiple Deprivation, Wales's own separate index, where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 55% of this district's postcodes sit in the most deprived three deciles, 24% in the least deprived three.
Deprivation deciles describe the LSOA neighbourhood each postcode sits in, weighted by postcodes rather than by people, because the postcode file carries no population. A district where the deprived neighbourhoods are densely populated will read better here than it would per resident.
Neighbouring districts in the CF area
CF5 · CF10 · CF11 · CF14 · CF15 · CF23 · CF24 · CF30 · CF31 · CF32 · CF33 · CF34 · CF35 · CF36 · CF37 · CF38 · CF39 · CF40 · CF41 · CF42 · CF43 · CF44 · CF45 · CF46 · CF47 · CF48 · CF61 · CF62 · CF63 · CF64 · CF71 · CF72 · CF81 · CF82 · CF83 · CF91 · CF95 · CF99
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.