ZIP Code 20818

20818 is one of Maryland's ZIP codes, delivering to addresses in Cabin John, Montgomery County.

City: Cabin John
County: Montgomery County
State: Maryland
Prefix: 208xx

Where this code sits

20818 is part of the 208xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Cabin John.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20818 delivers to without sharing its boundary.

ZIP codes nearest 20818

The ZIP codes whose reference points sit closest to 20818.
ZIP code	Distance	Delivers to
ZIP code 20812	0.9 mi	Glen Echo, MD
ZIP code 20817	1.1 mi	Bethesda, MD
ZIP code 20816	2.6 mi	Bethesda, MD
ZIP code 22101	2.9 mi	Mc Lean, VA
ZIP code 22106	3.0 mi	Mc Lean, VA
ZIP code 22109	3.0 mi	Mc Lean, VA
ZIP code 20810	3.2 mi	Bethesda, MD
ZIP code 20811	3.2 mi	Bethesda, 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 20818, plotted from its record coordinates.

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

Scope ZIP code 20818. 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.