Keswick Iowa ZIP Codes

Keswick holds a single ZIP code.

Every ZIP code in Keswick

The complete list of Keswick, Iowa ZIP codes with the county each falls in.
ZIP code	County
50136	Keokuk 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Keswick codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Keswick. 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 Keswick ZIP code begins 501. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 69 ZIP codes, so Keswick accounts for 1% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Keswick

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 Keswick occupies.

Keswick Iowa area codes in full →

Where Keswick's ZIP codes sit

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

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

Cities near Keswick

The closest places to Keswick with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Thornburg Iowa ZIP codes	4.9 mi	1 ZIP code
What Cheer Iowa ZIP codes	7.2 mi	1 ZIP code
South English Iowa ZIP codes	7.7 mi	1 ZIP code
Gibson Iowa ZIP codes	8.2 mi	1 ZIP code
Sigourney Iowa ZIP codes	8.5 mi	1 ZIP code
Millersburg Iowa ZIP codes	9.2 mi	1 ZIP code
North English Iowa ZIP codes	9.4 mi	1 ZIP code
Delta Iowa ZIP codes	10 mi	1 ZIP code

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