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Williamson Iowa ZIP Codes

Williamson holds a single ZIP code.

Every ZIP code in Williamson

The complete list of Williamson, Iowa ZIP codes with the county each falls in.
ZIP codeCounty
50272Lucas 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 . 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 502. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 65 ZIP codes, so Williamson accounts for 2% of it.

Every Iowa 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 code below serves the same ground Williamson occupies.

Williamson Iowa 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.
CityDistanceZIP codes
Chariton Iowa ZIP codes5.6 mi1 ZIP code
Russell Iowa ZIP codes8.0 mi1 ZIP code
Lacona Iowa ZIP codes9.7 mi1 ZIP code
Lucas Iowa ZIP codes11 mi1 ZIP code
Melrose Iowa ZIP codes13 mi1 ZIP code
Derby Iowa ZIP codes15 mi1 ZIP code
Millerton Iowa ZIP codes17 mi1 ZIP code
Milo Iowa ZIP codes17 mi1 ZIP code

Straight-line distance between place reference points, not driving distance.