The code 0437 merged Clunderwen (formerly 0991) with Haverfordwest (already on 0437) into a single area. As part of the PhONEday changes on 16th April 1995 the code became 01437. Numbers within each area can be identified by the first digit of the number after the code as shown below. Calls between these two areas (except numbers beginning 0 or 1) can be made without using the code.
Numbers |
Area |
| 0XXXXX | Haverfordwest |
| 1XXXXX | Haverfordwest |
| 2XXXXX | Clunderwen |
| 3XXXXX | Clunderwen |
| 4XXXXX | Clunderwen |
| 5XXXXX | Clunderwen |
| 6XXXXX | Haverfordwest |
| 7XXXXX | Haverfordwest |
| 8XXXXX | Haverfordwest |
| 9XXXXX | Haverfordwest |