ZIP Code 50156

50156 is one of Iowa's ZIP codes, delivering to addresses in Madrid, Boone County.

City: Madrid
County: Boone County
State: Iowa
Prefix: 501xx

Where this code sits

50156 is part of the 501xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Madrid.

Madrid Iowa ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 50156 delivers to without sharing its boundary.

515 Area code 515

ZIP codes nearest 50156

The ZIP codes whose reference points sit closest to 50156.
ZIP code	Distance	Delivers to
ZIP code 50152	3.8 mi	Luther, IA
ZIP code 50276	4.1 mi	Woodward, IA
ZIP code 50243	7.8 mi	Sheldahl, IA
ZIP code 50244	8.4 mi	Slater, IA
ZIP code 50109	8.6 mi	Granger, IA
ZIP code 50039	8.7 mi	Bouton, IA
ZIP code 50134	10 mi	Kelley, IA
ZIP code 50226	12 mi	Polk 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 50156, plotted from its record coordinates.

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

Scope ZIP code 50156. 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.