ZIP Code 20830

20830 is one of Maryland's ZIP codes, delivering to addresses in Olney, Montgomery County.

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

Where this code sits

20830 is part of the 208xx range, the group of codes handled by one mail processing centre. Olney is served by 2 ZIP codes in total.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 20830 delivers to without sharing its boundary.

ZIP codes nearest 20830

The ZIP codes whose reference points sit closest to 20830.
ZIP code	Distance	Delivers to
ZIP code 20832	0.5 mi	Olney, MD
ZIP code 20860	2.0 mi	Sandy Spring, MD
ZIP code 20833	2.2 mi	Brookeville, MD
ZIP code 20862	3.3 mi	Brinklow, MD
ZIP code 20861	4.0 mi	Ashton, MD
ZIP code 20905	4.3 mi	Silver Spring, MD
ZIP code 20855	4.6 mi	Derwood, MD
ZIP code 20853	4.8 mi	Rockville, 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 20830, plotted from its record coordinates.

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

Scope ZIP code 20830. 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.