ZIP Code 48028

48028 is one of Michigan's ZIP codes, delivering to addresses in Harsens Island, St. Clair County.

City: Harsens Island
County: St. Clair County
State: Michigan
Prefix: 480xx

Where this code sits

48028 is part of the 480xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Harsens Island.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 48028 delivers to without sharing its boundary.

810 Area code 810

ZIP codes nearest 48028

The ZIP codes whose reference points sit closest to 48028.
ZIP code	Distance	Delivers to
ZIP code 48001	3.6 mi	Algonac, MI
ZIP code 48039	7.2 mi	Marine City, MI
ZIP code 48023	9.1 mi	Fair Haven, MI
ZIP code 48047	11 mi	New Baltimore, MI
ZIP code 48045	12 mi	Harrison Township, MI
ZIP code 48064	13 mi	Casco, MI
ZIP code 48054	13 mi	East China, MI
ZIP code 48051	14 mi	New Baltimore, 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 48028, plotted from its record coordinates.

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

Scope ZIP code 48028. 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.