ZIP Code 50138

50138 is one of Iowa's ZIP codes, delivering to addresses in Knoxville, Marion County.

City: Knoxville
County: Marion County
State: Iowa
Prefix: 501xx

Where this code sits

50138 is part of the 501xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Knoxville.

Knoxville Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 50138 delivers to without sharing its boundary.

641 Area code 641

ZIP codes nearest 50138

The ZIP codes whose reference points sit closest to 50138.
ZIP code	Distance	Delivers to
ZIP code 50119	8.5 mi	Harvey, IA
ZIP code 50057	9.7 mi	Columbia, IA
ZIP code 50062	9.9 mi	Melcher Dallas, IA
ZIP code 50163	9.9 mi	Melcher Dallas, IA
ZIP code 50214	9.9 mi	Otley, IA
ZIP code 50225	9.9 mi	Pleasantville, IA
ZIP code 50219	11 mi	Pella, IA
ZIP code 50116	11 mi	Hamilton, IA

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

Each point is the reference point for 50138, plotted from its record coordinates.

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

Scope ZIP code 50138. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.