ZIP Code 51243

51243 is one of Iowa's ZIP codes, delivering to addresses in Little Rock, Lyon County.

City: Little Rock
County: Lyon County
State: Iowa
Prefix: 512xx

Where this code sits

51243 is part of the 512xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Little Rock.

Little Rock Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51243 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51243

The ZIP codes whose reference points sit closest to 51243.
ZIP code	Distance	Delivers to
ZIP code 56129	8.0 mi	Ellsworth, MN
ZIP code 51249	8.1 mi	Sibley, IA
ZIP code 51237	8.8 mi	George, IA
ZIP code 51232	12 mi	Ashton, IA
ZIP code 56110	12 mi	Adrian, MN
ZIP code 56146	13 mi	Kanaranzi, MN
ZIP code 56168	13 mi	Rushmore, MN
ZIP code 56117	13 mi	Bigelow, MN

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 51243, plotted from its record coordinates.

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

Scope ZIP code 51243. 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.