ZIP Code 21084

21084 is one of Maryland's ZIP codes, delivering to addresses in Jarrettsville, Harford County.

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

Where this code sits

21084 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Jarrettsville.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21084 delivers to without sharing its boundary.

ZIP codes nearest 21084

The ZIP codes whose reference points sit closest to 21084.
ZIP code	Distance	Delivers to
ZIP code 21050	4.6 mi	Forest Hill, MD
ZIP code 21154	5.9 mi	Street, MD
ZIP code 21161	6.1 mi	White Hall, MD
ZIP code 21132	6.3 mi	Pylesville, MD
ZIP code 21047	6.4 mi	Fallston, MD
ZIP code 21013	6.8 mi	Baldwin, MD
ZIP code 21111	7.7 mi	Monkton, MD
ZIP code 21014	8.0 mi	Bel Air, 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 21084, plotted from its record coordinates.

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

Scope ZIP code 21084. 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.