Postcode BT21
Donaghadee · Northern Ireland
BT21 is the postcode of Donaghadee in Northern Ireland, United Kingdom. This list covers outward codes — the first half of a UK postcode, such as M9 or BN91 — not full postcodes.
- Postcode
- BT21
- County
- —
- Country
- Northern Ireland
- Country
- United Kingdom
Place with postcode BT21
| Place | County | Location |
|---|---|---|
| Donaghadee | — | 54.641, -5.536 |
Nearby postcodes
Frequently asked questions
Which places use postcode BT21?
Donaghadee.
Which county and country is BT21 in?
Northern Ireland, United Kingdom.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.