Carmarthen Welsh: Caerfyrddin
Carmarthen town centre
Carmarthen
Location within Carmarthenshire
Population	16,285 (2019)
OS grid reference	SN415205
Principal area	Carmarthenshire
Ceremonial county	Dyfed
Country	Wales
Sovereign state	United Kingdom
Post town	CARMARTHEN
Postcode district	SA31, SA32, SA33
Dialling code	01267

Police	Dyfed-Powys
Fire	Mid and West Wales
Ambulance	Welsh

UK Parliament	Carmarthen East and Dinefwr Carmarthen West and South Pembrokeshire
List of places UK Wales Carmarthenshire 51°51′22″N 4°18′58″W / 51.856°N 4.316°W / 51.856; -4.316

Carmarthen (Welsh: Caerfyrddin) is a community and town in Carmarthenshire in South West Wales. In 2019, it was found that 16,285 people live there.

It is Carmarthenshire's county town, but the largest town in Llanelli.

The town's name in Welsh means Merlin's fort or Sea-town fort.

It is said to be Wales' oldest town after Old Carmarthen and New Carmarthen became one borough in 1546.

It has a castle, Carmarthen Castle.