ZIP Code 51521

51521 is one of Iowa's ZIP codes, delivering to addresses in Avoca, Pottawattamie County.

City: Avoca
County: Pottawattamie County
State: Iowa
Prefix: 515xx

Where this code sits

51521 is part of the 515xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Avoca.

Avoca Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51521 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51521

The ZIP codes whose reference points sit closest to 51521.
ZIP code	Distance	Delivers to
ZIP code 51593	1.6 mi	Harlan, IA
ZIP code 51570	6.3 mi	Shelby, IA
ZIP code 51536	6.5 mi	Hancock, IA
ZIP code 51577	7.0 mi	Walnut, IA
ZIP code 51553	10 mi	Minden, IA
ZIP code 51560	12 mi	Oakland, IA
ZIP code 51537	12 mi	Harlan, IA
ZIP code 51563	13 mi	Persia, 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 51521, plotted from its record coordinates.

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

Scope ZIP code 51521. 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.