ZIP Code 19966

19966 is one of Delaware's ZIP codes, delivering to addresses in Millsboro, Sussex County.

City: Millsboro
County: Sussex County
State: Delaware
Prefix: 199xx

Where this code sits

19966 is part of the 199xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Millsboro.

Millsboro Delaware ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 19966 delivers to without sharing its boundary.

302 Area code 302

ZIP codes nearest 19966

The ZIP codes whose reference points sit closest to 19966.
ZIP code	Distance	Delivers to
ZIP code 19951	1.5 mi	Harbeson, DE
ZIP code 19958	6.7 mi	Lewes, DE
ZIP code 19969	7.1 mi	Nassau, DE
ZIP code 19939	7.2 mi	Dagsboro, DE
ZIP code 19968	8.0 mi	Milton, DE
ZIP code 19947	8.0 mi	Georgetown, DE
ZIP code 19967	10 mi	Millville, DE
ZIP code 19945	10 mi	Frankford, DE

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 19966, plotted from its record coordinates.

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

Scope ZIP code 19966. 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.