ZIP Code 48421

48421 is one of Michigan's ZIP codes, delivering to addresses in Columbiaville, Lapeer County.

City: Columbiaville
County: Lapeer County
State: Michigan
Prefix: 484xx

Where this code sits

48421 is part of the 484xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Columbiaville.

Columbiaville Michigan ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 48421 delivers to without sharing its boundary.

810 Area code 810

ZIP codes nearest 48421

The ZIP codes whose reference points sit closest to 48421.
ZIP code	Distance	Delivers to
ZIP code 48464	5.2 mi	Otter Lake, MI
ZIP code 48446	6.8 mi	Lapeer, MI
ZIP code 48463	7.0 mi	Otisville, MI
ZIP code 48435	7.9 mi	Fostoria, MI
ZIP code 48461	8.7 mi	North Branch, MI
ZIP code 48423	11 mi	Davison, MI
ZIP code 48437	12 mi	Genesee, MI
ZIP code 48746	12 mi	Millington, 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 48421, plotted from its record coordinates.

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

Scope ZIP code 48421. 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.