ZIP Code 21555

21555 is one of Maryland's ZIP codes, delivering to addresses in Oldtown, Allegany County.

City: Oldtown
County: Allegany County
State: Maryland
Prefix: 215xx

Where this code sits

21555 is part of the 215xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Oldtown.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21555 delivers to without sharing its boundary.

ZIP codes nearest 21555

The ZIP codes whose reference points sit closest to 21555.
ZIP code	Distance	Delivers to
ZIP code 21504	4.6 mi	Cumberland, MD
ZIP code 26722	5.8 mi	Green Spring, WV
ZIP code 21560	6.1 mi	Spring Gap, MD
ZIP code 25431	6.7 mi	Levels, WV
ZIP code 21530	8.1 mi	Flintstone, MD
ZIP code 26767	9.3 mi	Wiley Ford, WV
ZIP code 21501	9.6 mi	Cumberland, MD
ZIP code 21503	9.6 mi	Cumberland, 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 21555, plotted from its record coordinates.

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

Scope ZIP code 21555. 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.