ZIP Code 21920

21920 is one of Maryland's ZIP codes, delivering to addresses in Elk Mills, Cecil County.

City: Elk Mills
County: Cecil County
State: Maryland
Prefix: 219xx

Where this code sits

21920 is part of the 219xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Elk Mills.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21920 delivers to without sharing its boundary.

ZIP codes nearest 21920

The ZIP codes whose reference points sit closest to 21920.
ZIP code	Distance	Delivers to
ZIP code 21921	2.4 mi	Elkton, MD
ZIP code 21916	2.4 mi	Childs, MD
ZIP code 21922	3.5 mi	Elkton, MD
ZIP code 19716	4.3 mi	Newark, DE
ZIP code 19717	4.5 mi	Newark, DE
ZIP code 19351	5.1 mi	Lewisville, PA
ZIP code 19360	5.2 mi	New London, PA
ZIP code 19711	5.7 mi	Newark, 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 21920, plotted from its record coordinates.

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

Scope ZIP code 21920. 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.