ZIP Code 20620

20620 is one of Maryland's ZIP codes, delivering to addresses in Callaway, St. Mary's County.

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

Where this code sits

20620 is part of the 206xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Callaway.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20620 delivers to without sharing its boundary.

ZIP codes nearest 20620

The ZIP codes whose reference points sit closest to 20620.
ZIP code	Distance	Delivers to
ZIP code 20692	2.7 mi	Valley Lee, MD
ZIP code 20634	3.1 mi	Great Mills, MD
ZIP code 20653	4.0 mi	Lexington Park, MD
ZIP code 20667	4.3 mi	Park Hall, MD
ZIP code 20690	4.4 mi	Tall Timbers, MD
ZIP code 20630	4.6 mi	Drayden, MD
ZIP code 20619	5.1 mi	California, MD
ZIP code 20686	5.5 mi	Saint Marys City, 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 20620, plotted from its record coordinates.

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

Scope ZIP code 20620. 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.