ZIP Code 21912

21912 is one of Maryland's ZIP codes, delivering to addresses in Warwick, Cecil County.

City: Warwick
County: Cecil County
State: Maryland
Prefix: 219xx

Where this code sits

21912 is part of the 219xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Warwick.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21912 delivers to without sharing its boundary.

ZIP codes nearest 21912

The ZIP codes whose reference points sit closest to 21912.
ZIP code	Distance	Delivers to
ZIP code 21913	4.0 mi	Cecilton, MD
ZIP code 21930	6.2 mi	Georgetown, MD
ZIP code 21915	6.3 mi	Chesapeake City, MD
ZIP code 19734	7.0 mi	Townsend, DE
ZIP code 19709	7.2 mi	Middletown, DE
ZIP code 21635	7.4 mi	Galena, MD
ZIP code 21919	7.5 mi	Earleville, MD
ZIP code 19730	8.1 mi	Odessa, DE

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 21912, plotted from its record coordinates.

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

Scope ZIP code 21912. 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.