ZIP Code 21866

21866 is one of Maryland's ZIP codes, delivering to addresses in Tylerton, Somerset County.

City: Tylerton
County: Somerset County
State: Maryland
Prefix: 218xx

Where this code sits

21866 is part of the 218xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Tylerton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21866 delivers to without sharing its boundary.

ZIP codes nearest 21866

The ZIP codes whose reference points sit closest to 21866.
ZIP code	Distance	Delivers to
ZIP code 21824	2.0 mi	Ewell, MD
ZIP code 21817	9.9 mi	Crisfield, MD
ZIP code 23440	10 mi	Tangier, VA
ZIP code 21890	11 mi	Westover, MD
ZIP code 21821	14 mi	Deal Island, MD
ZIP code 21838	15 mi	Marion Station, MD
ZIP code 22530	15 mi	Ophelia, VA
ZIP code 21867	16 mi	Upper Fairmount, 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 21866, plotted from its record coordinates.

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

Scope ZIP code 21866. 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.