ZIP Code 46320

46320 is one of Indiana's ZIP codes, delivering to addresses in Hammond, Lake County.

City: Hammond
County: Lake County
State: Indiana
Prefix: 463xx

Where this code sits

46320 is part of the 463xx range, the group of codes handled by one mail processing centre. Hammond is served by 5 ZIP codes in total; the full list, with the county each falls in, is on the Hammond page.

Hammond Indiana ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 46320 delivers to without sharing its boundary.

219 Area code 219

ZIP codes nearest 46320

The ZIP codes whose reference points sit closest to 46320.
ZIP code	Distance	Delivers to
ZIP code 46327	1.6 mi	Hammond, IN
ZIP code 46324	1.8 mi	Hammond, IN
ZIP code 60409	2.1 mi	Calumet City, IL
ZIP code 46312	2.9 mi	East Chicago, IN
ZIP code 46323	3.2 mi	Hammond, IN
ZIP code 60438	3.6 mi	Lansing, IL
ZIP code 46321	3.9 mi	Munster, IN
ZIP code 60473	4.5 mi	South Holland, IL

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 46320, plotted from its record coordinates.

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

Scope ZIP code 46320. 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.