ZIP Code 49240

49240 is one of Michigan's ZIP codes, delivering to addresses in Grass Lake, Jackson County.

City: Grass Lake
County: Jackson County
State: Michigan
Prefix: 492xx

Where this code sits

49240 is part of the 492xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Grass Lake.

Grass Lake Michigan ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 49240 delivers to without sharing its boundary.

ZIP codes nearest 49240

The ZIP codes whose reference points sit closest to 49240.
ZIP code	Distance	Delivers to
ZIP code 49254	6.9 mi	Michigan Center, MI
ZIP code 49259	7.4 mi	Munith, MI
ZIP code 49263	7.8 mi	Norvell, MI
ZIP code 49261	7.8 mi	Napoleon, MI
ZIP code 48118	8.9 mi	Chelsea, MI
ZIP code 49201	10 mi	Jackson, MI
ZIP code 49204	11 mi	Jackson, MI
ZIP code 49202	11 mi	Jackson, 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 49240, plotted from its record coordinates.

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

Scope ZIP code 49240. 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.