ZIP Code 20609

20609 is one of Maryland's ZIP codes, delivering to addresses in Avenue, St. Mary's County.

City: Avenue
County: St. Mary's County
State: Maryland
Prefix: 206xx

Where this code sits

20609 is part of the 206xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Avenue.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20609 delivers to without sharing its boundary.

ZIP codes nearest 20609

The ZIP codes whose reference points sit closest to 20609.
ZIP code	Distance	Delivers to
ZIP code 20627	2.3 mi	Compton, MD
ZIP code 20606	2.5 mi	Abell, MD
ZIP code 20618	2.5 mi	Bushwood, MD
ZIP code 20626	3.3 mi	Coltons Point, MD
ZIP code 20624	4.2 mi	Clements, MD
ZIP code 20621	5.1 mi	Chaptico, MD
ZIP code 20682	5.5 mi	Rock Point, MD
ZIP code 20625	5.8 mi	Cobb Island, 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 20609, plotted from its record coordinates.

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

Scope ZIP code 20609. 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.