ZIP Code 50440

50440 is one of Iowa's ZIP codes, delivering to addresses in Grafton, Worth County.

City: Grafton
County: Worth County
State: Iowa
Prefix: 504xx

Where this code sits

50440 is part of the 504xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Grafton.

Grafton Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 50440 delivers to without sharing its boundary.

641 Area code 641

ZIP codes nearest 50440

The ZIP codes whose reference points sit closest to 50440.
ZIP code	Distance	Delivers to
ZIP code 50464	5.0 mi	Plymouth, IA
ZIP code 50456	6.3 mi	Manly, IA
ZIP code 50448	7.2 mi	Kensett, IA
ZIP code 50467	7.2 mi	Rock Falls, IA
ZIP code 50426	7.9 mi	Carpenter, IA
ZIP code 50472	10 mi	Saint Ansgar, IA
ZIP code 50458	12 mi	Nora Springs, IA
ZIP code 50402	13 mi	Mason City, 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 50440, plotted from its record coordinates.

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

Scope ZIP code 50440. 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.