ZIP Code 20842

20842 is one of Maryland's ZIP codes, delivering to addresses in Dickerson, Montgomery County.

City: Dickerson
County: Montgomery County
State: Maryland
Prefix: 208xx

Where this code sits

20842 is part of the 208xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Dickerson.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20842 delivers to without sharing its boundary.

ZIP codes nearest 20842

The ZIP codes whose reference points sit closest to 20842.
ZIP code	Distance	Delivers to
ZIP code 20839	2.4 mi	Beallsville, MD
ZIP code 20838	2.4 mi	Barnesville, MD
ZIP code 20837	5.2 mi	Poolesville, MD
ZIP code 20841	5.5 mi	Boyds, MD
ZIP code 21710	5.7 mi	Adamstown, MD
ZIP code 21790	6.1 mi	Tuscarora, MD
ZIP code 20176	6.6 mi	Leesburg, VA
ZIP code 21777	7.6 mi	Point Of Rocks, 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 20842, plotted from its record coordinates.

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

Scope ZIP code 20842. 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.