Codes.zone

Knoxville Iowa ZIP Codes

Knoxville holds a single ZIP code.

Every ZIP code in Knoxville

The complete list of Knoxville, Iowa ZIP codes with the county each falls in.
ZIP codeCounty
50138Marion 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Knoxville codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Knoxville. 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 Knoxville 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 Knoxville accounts for 1% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Knoxville

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 Knoxville occupies.

Knoxville Iowa area codes in full →

Where Knoxville's ZIP codes sit

Each point is one Knoxville ZIP code, plotted from its record coordinates.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Cities near Knoxville

The closest places to Knoxville with their own ZIP code list, nearest first.
CityDistanceZIP codes
Harvey Iowa ZIP codes9.3 mi1 ZIP code
Pleasantville Iowa ZIP codes10 mi1 ZIP code
Pella Iowa ZIP codes11 mi1 ZIP code
Bussey Iowa ZIP codes14 mi1 ZIP code
Monroe Iowa ZIP codes14 mi1 ZIP code
Hamilton Iowa ZIP codes15 mi1 ZIP code
Swan Iowa ZIP codes15 mi1 ZIP code
Lovilia Iowa ZIP codes16 mi1 ZIP code

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