ZIP Code 21034

21034 is one of Maryland's ZIP codes, delivering to addresses in Darlington, Harford County.

City: Darlington
County: Harford County
State: Maryland
Prefix: 210xx

Where this code sits

21034 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Darlington.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21034 delivers to without sharing its boundary.

ZIP codes nearest 21034

The ZIP codes whose reference points sit closest to 21034.
ZIP code	Distance	Delivers to
ZIP code 21918	4.1 mi	Conowingo, MD
ZIP code 21160	6.0 mi	Whiteford, MD
ZIP code 21028	6.3 mi	Churchville, MD
ZIP code 21917	7.2 mi	Colora, MD
ZIP code 21154	7.6 mi	Street, MD
ZIP code 17563	8.5 mi	Peach Bottom, PA
ZIP code 21904	9.2 mi	Port Deposit, MD
ZIP code 17314	9.2 mi	Delta, PA

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 21034, plotted from its record coordinates.

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

Scope ZIP code 21034. 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.