ZIP Code 17603

17603 is one of Pennsylvania's ZIP codes, delivering to addresses in Lancaster, Lancaster County.

City: Lancaster
County: Lancaster County
State: Pennsylvania
Prefix: 176xx

Where this code sits

17603 is part of the 176xx range, the group of codes handled by one mail processing centre. Lancaster is served by 11 ZIP codes in total; the full list, with the county each falls in, is on the Lancaster page.

Lancaster Pennsylvania ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 17603 delivers to without sharing its boundary.

ZIP codes nearest 17603

The ZIP codes whose reference points sit closest to 17603.
ZIP code	Distance	Delivers to
ZIP code 17551	0.9 mi	Millersville, PA
ZIP code 17504	2.3 mi	Bausman, PA
ZIP code 17503	3.7 mi	Bart, PA
ZIP code 17564	3.7 mi	Penryn, PA
ZIP code 17605	3.7 mi	Lancaster, PA
ZIP code 17607	3.7 mi	Lancaster, PA
ZIP code 17608	3.7 mi	Lancaster, PA
ZIP code 17699	3.7 mi	Lancaster, PA

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 17603, plotted from its record coordinates.

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

Scope ZIP code 17603. 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.