ZIP Code 49239

49239 is one of Michigan's ZIP codes, delivering to addresses in Frontier, Hillsdale County.

City: Frontier
County: Hillsdale County
State: Michigan
Prefix: 492xx

Where this code sits

49239 is part of the 492xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Frontier.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 49239 delivers to without sharing its boundary.

517 Area code 517

ZIP codes nearest 49239

The ZIP codes whose reference points sit closest to 49239.
ZIP code	Distance	Delivers to
ZIP code 49266	3.9 mi	Osseo, MI
ZIP code 49232	7.0 mi	Camden, MI
ZIP code 49288	8.5 mi	Waldron, MI
ZIP code 43554	8.8 mi	Pioneer, OH
ZIP code 49274	9.3 mi	Reading, MI
ZIP code 49242	9.8 mi	Hillsdale, MI
ZIP code 49271	11 mi	Pittsford, MI
ZIP code 43531	12 mi	Kunkle, OH

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 49239, plotted from its record coordinates.

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

Scope ZIP code 49239. 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.