ZIP Code 21917

21917 is one of Maryland's ZIP codes, delivering to addresses in Colora, Cecil County.

City: Colora
County: Cecil County
State: Maryland
Prefix: 219xx

Where this code sits

21917 is part of the 219xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Colora.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 21917 delivers to without sharing its boundary.

ZIP codes nearest 21917

The ZIP codes whose reference points sit closest to 21917.
ZIP code	Distance	Delivers to
ZIP code 21911	2.7 mi	Rising Sun, MD
ZIP code 21918	3.4 mi	Conowingo, MD
ZIP code 21904	4.1 mi	Port Deposit, MD
ZIP code 19362	6.0 mi	Nottingham, PA
ZIP code 21034	7.2 mi	Darlington, MD
ZIP code 21903	7.5 mi	Perryville, MD
ZIP code 21902	8.1 mi	Perry Point, MD
ZIP code 21078	8.2 mi	Havre De Grace, 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 21917, plotted from its record coordinates.

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

Scope ZIP code 21917. 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.