Williamson West Virginia ZIP Codes

Williamson holds a single ZIP code.

Every ZIP code in Williamson

The complete list of Williamson, West Virginia ZIP codes with the county each falls in.
ZIP code	County
25661	Mingo County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Williamson codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Williamson. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Williamson ZIP code begins 256. Those first three digits identify the sectional center facility that processes mail for this part of West Virginia. Statewide that range covers 47 ZIP codes, so Williamson accounts for 2% of it.

Every West Virginia ZIP prefix and the region it covers →

Area codes covering Williamson

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Williamson occupies.

Williamson West Virginia area codes in full →

Where Williamson's ZIP codes sit

Each point is one Williamson ZIP code, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Cities near Williamson

The closest places to Williamson with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Delbarton West Virginia ZIP codes	5.1 mi	1 ZIP code
Matewan West Virginia ZIP codes	7.1 mi	1 ZIP code
Kermit West Virginia ZIP codes	14 mi	1 ZIP code
Logan West Virginia ZIP codes	20 mi	1 ZIP code
Man West Virginia ZIP codes	22 mi	1 ZIP code
Gilbert West Virginia ZIP codes	22 mi	1 ZIP code
Chapmanville West Virginia ZIP codes	25 mi	1 ZIP code
Hanover West Virginia ZIP codes	26 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.