ZIP Code 51640

51640 is one of Iowa's ZIP codes, delivering to addresses in Hamburg, Fremont County.

City: Hamburg
County: Fremont County
State: Iowa
Prefix: 516xx

Where this code sits

51640 is part of the 516xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Hamburg.

Hamburg Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 51640 delivers to without sharing its boundary.

712 Area code 712

ZIP codes nearest 51640

The ZIP codes whose reference points sit closest to 51640.
ZIP code	Distance	Delivers to
ZIP code 51650	4.2 mi	Riverton, IA
ZIP code 51652	9.4 mi	Sidney, IA
ZIP code 64496	9.5 mi	Watson, MO
ZIP code 51639	11 mi	Farragut, IA
ZIP code 68421	11 mi	Peru, NE
ZIP code 51648	13 mi	Percival, IA
ZIP code 68410	13 mi	Nebraska City, NE
ZIP code 64482	14 mi	Rock Port, MO

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 51640, plotted from its record coordinates.

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

Scope ZIP code 51640. 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.