ZIP Code 51240

51240 is one of Iowa's ZIP codes, delivering to addresses in Inwood, Lyon County.

City: Inwood
County: Lyon County
State: Iowa
Prefix: 512xx

Where this code sits

51240 is part of the 512xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Inwood.

Inwood Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51240 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51240

The ZIP codes whose reference points sit closest to 51240.
ZIP code	Distance	Delivers to
ZIP code 51230	7.4 mi	Alvord, IA
ZIP code 57013	7.9 mi	Canton, SD
ZIP code 57027	8.4 mi	Fairview, SD
ZIP code 51241	9.3 mi	Larchwood, IA
ZIP code 51247	9.5 mi	Rock Valley, IA
ZIP code 51242	11 mi	Lester, IA
ZIP code 51235	12 mi	Doon, IA
ZIP code 57034	13 mi	Hudson, SD

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 51240, plotted from its record coordinates.

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

Scope ZIP code 51240. 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.