ZIP Code 20643

20643 is one of Maryland's ZIP codes, delivering to addresses in Ironsides, Charles County.

City: Ironsides
County: Charles County
State: Maryland
Prefix: 206xx

Where this code sits

20643 is part of the 206xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ironsides.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20643 delivers to without sharing its boundary.

ZIP codes nearest 20643

The ZIP codes whose reference points sit closest to 20643.
ZIP code	Distance	Delivers to
ZIP code 20693	3.8 mi	Welcome, MD
ZIP code 20658	4.1 mi	Marbury, MD
ZIP code 20662	4.8 mi	Nanjemoy, MD
ZIP code 20677	5.8 mi	Port Tobacco, MD
ZIP code 20640	6.7 mi	Indian Head, MD
ZIP code 22135	8.0 mi	Quantico, VA
ZIP code 20646	8.9 mi	La Plata, MD
ZIP code 22026	8.9 mi	Dumfries, 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 20643, plotted from its record coordinates.

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

Scope ZIP code 20643. 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.