ZIP Code 20640

20640 is one of Maryland's ZIP codes, delivering to addresses in Indian Head, Charles County.

City: Indian Head
County: Charles County
State: Maryland
Prefix: 206xx

Where this code sits

20640 is part of the 206xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Indian Head.

Indian Head Maryland ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20640 delivers to without sharing its boundary.

ZIP codes nearest 20640

The ZIP codes whose reference points sit closest to 20640.
ZIP code	Distance	Delivers to
ZIP code 20658	2.5 mi	Marbury, MD
ZIP code 20616	5.4 mi	Bryans Road, MD
ZIP code 22194	6.2 mi	Woodbridge, VA
ZIP code 22195	6.2 mi	Woodbridge, VA
ZIP code 22191	6.2 mi	Woodbridge, VA
ZIP code 22060	6.6 mi	Fort Belvoir, VA
ZIP code 20643	6.7 mi	Ironsides, MD
ZIP code 22079	6.8 mi	Lorton, VA

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 20640, plotted from its record coordinates.

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

Scope ZIP code 20640. 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.