ZIP Code 46304

46304 is one of Indiana's ZIP codes, delivering to addresses in Chesterton, Porter County.

City: Chesterton
County: Porter County
State: Indiana
Prefix: 463xx

Where this code sits

46304 is part of the 463xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Chesterton.

Chesterton Indiana ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 46304 delivers to without sharing its boundary.

219 Area code 219

ZIP codes nearest 46304

The ZIP codes whose reference points sit closest to 46304.
ZIP code	Distance	Delivers to
ZIP code 46301	6.5 mi	Beverly Shores, IN
ZIP code 46368	7.4 mi	Portage, IN
ZIP code 46384	8.7 mi	Valparaiso, IN
ZIP code 46361	9.2 mi	Michigan City, IN
ZIP code 46391	9.3 mi	Westville, IN
ZIP code 46393	9.9 mi	Wheeler, IN
ZIP code 46385	10 mi	Valparaiso, IN
ZIP code 46360	11 mi	Michigan City, IN

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 46304, plotted from its record coordinates.

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

Scope ZIP code 46304. 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.