ZIP Code 21088

21088 is one of Maryland's ZIP codes, delivering to addresses in Lineboro, Carroll County.

City: Lineboro
County: Carroll County
State: Maryland
Prefix: 210xx

Where this code sits

21088 is part of the 210xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Lineboro.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21088 delivers to without sharing its boundary.

ZIP codes nearest 21088

The ZIP codes whose reference points sit closest to 21088.
ZIP code	Distance	Delivers to
ZIP code 17329	3.1 mi	Glenville, PA
ZIP code 21102	4.0 mi	Manchester, MD
ZIP code 21053	6.7 mi	Freeland, MD
ZIP code 17327	6.7 mi	Glen Rock, PA
ZIP code 21074	7.3 mi	Hampstead, MD
ZIP code 17354	7.9 mi	Porters Sideling, PA
ZIP code 17355	8.1 mi	Railroad, PA
ZIP code 17349	8.6 mi	New Freedom, 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 21088, plotted from its record coordinates.

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

Scope ZIP code 21088. 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.