ZIP Code 21018

21018 is one of Maryland's ZIP codes, delivering to addresses in Benson, Harford County.

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

Where this code sits

21018 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Benson.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21018 delivers to without sharing its boundary.

ZIP codes nearest 21018

The ZIP codes whose reference points sit closest to 21018.
ZIP code	Distance	Delivers to
ZIP code 21014	2.6 mi	Bel Air, MD
ZIP code 21047	2.8 mi	Fallston, MD
ZIP code 21015	4.0 mi	Bel Air, MD
ZIP code 21087	4.0 mi	Kingsville, MD
ZIP code 21051	4.2 mi	Fork, MD
ZIP code 21050	4.6 mi	Forest Hill, MD
ZIP code 21156	5.0 mi	Upper Falls, MD
ZIP code 21082	5.1 mi	Hydes, 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 21018, plotted from its record coordinates.

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

Scope ZIP code 21018. 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.