ZIP Code 50401

50401 is one of Iowa's ZIP codes, delivering to addresses in Mason City, Cerro Gordo County.

City: Mason City
County: Cerro Gordo County
State: Iowa
Prefix: 504xx

Where this code sits

50401 is part of the 504xx range, the group of codes handled by one mail processing centre. Mason City is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Mason City page.

Mason City Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 50401 delivers to without sharing its boundary.

641 Area code 641

ZIP codes nearest 50401

The ZIP codes whose reference points sit closest to 50401.
ZIP code	Distance	Delivers to
ZIP code 50402	0.4 mi	Mason City, IA
ZIP code 50467	6.8 mi	Rock Falls, IA
ZIP code 50464	7.6 mi	Plymouth, IA
ZIP code 50428	9.6 mi	Clear Lake, IA
ZIP code 50456	9.6 mi	Manly, IA
ZIP code 50458	9.8 mi	Nora Springs, IA
ZIP code 50469	10 mi	Rockwell, IA
ZIP code 50440	13 mi	Grafton, 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 50401, plotted from its record coordinates.

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

Scope ZIP code 50401. 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.