ZIP Code 21204

21204 is one of Maryland's ZIP codes, delivering to addresses in Towson, Baltimore County.

City: Towson
County: Baltimore County
State: Maryland
Prefix: 212xx

Where this code sits

21204 is part of the 212xx range, the group of codes handled by one mail processing centre. Towson is served by 5 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21204 delivers to without sharing its boundary.

ZIP codes nearest 21204

The ZIP codes whose reference points sit closest to 21204.
ZIP code	Distance	Delivers to
ZIP code 21252	0.4 mi	Towson, MD
ZIP code 21284	0.4 mi	Towson, MD
ZIP code 21285	0.4 mi	Towson, MD
ZIP code 21286	1.6 mi	Towson, MD
ZIP code 21094	2.3 mi	Lutherville Timonium, MD
ZIP code 21251	2.3 mi	Baltimore, MD
ZIP code 21139	2.4 mi	Riderwood, MD
ZIP code 21212	3.1 mi	Baltimore, MD

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 21204, plotted from its record coordinates.

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

Scope ZIP code 21204. 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.