ZIP Code 48191

48191 is one of Michigan's ZIP codes, delivering to addresses in Willis, Washtenaw County.

City: Willis
County: Washtenaw County
State: Michigan
Prefix: 481xx

Where this code sits

48191 is part of the 481xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Willis.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 48191 delivers to without sharing its boundary.

734 Area code 734

ZIP codes nearest 48191

The ZIP codes whose reference points sit closest to 48191.
ZIP code	Distance	Delivers to
ZIP code 48190	1.4 mi	Whittaker, MI
ZIP code 48160	6.2 mi	Milan, MI
ZIP code 48111	6.2 mi	Belleville, MI
ZIP code 48112	6.8 mi	Belleville, MI
ZIP code 48159	7.4 mi	Maybee, MI
ZIP code 48197	7.9 mi	Ypsilanti, MI
ZIP code 48198	8.0 mi	Ypsilanti, MI
ZIP code 48110	9.7 mi	Azalia, MI

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 48191, plotted from its record coordinates.

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

Scope ZIP code 48191. 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.