ZIP Code 21111

21111 is one of Maryland's ZIP codes, delivering to addresses in Monkton, Baltimore County.

City: Monkton
County: Baltimore County
State: Maryland
Prefix: 211xx

Where this code sits

21111 is part of the 211xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Monkton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21111 delivers to without sharing its boundary.

ZIP codes nearest 21111

The ZIP codes whose reference points sit closest to 21111.
ZIP code	Distance	Delivers to
ZIP code 21152	4.6 mi	Sparks Glencoe, MD
ZIP code 21131	5.8 mi	Phoenix, MD
ZIP code 21065	6.2 mi	Hunt Valley, MD
ZIP code 21030	6.3 mi	Cockeysville, MD
ZIP code 21013	6.5 mi	Baldwin, MD
ZIP code 21120	6.6 mi	Parkton, MD
ZIP code 21031	6.7 mi	Hunt Valley, MD
ZIP code 21161	6.8 mi	White Hall, 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 21111, plotted from its record coordinates.

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

Scope ZIP code 21111. 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.