ZIP Code 13603

13603 is one of New York's ZIP codes, delivering to addresses in Watertown, Jefferson County.

City: Watertown
County: Jefferson County
State: New York
Prefix: 136xx

Where this code sits

13603 is part of the 136xx range, the group of codes handled by one mail processing centre. Watertown is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Watertown page.

Watertown New York ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 13603 delivers to without sharing its boundary.

ZIP codes nearest 13603

The ZIP codes whose reference points sit closest to 13603.
ZIP code	Distance	Delivers to
ZIP code 13682	3.4 mi	Rodman, NY
ZIP code 13601	4.6 mi	Watertown, NY
ZIP code 13606	6.2 mi	Adams Center, NY
ZIP code 13615	8.1 mi	Brownville, NY
ZIP code 13612	8.3 mi	Black River, NY
ZIP code 13616	8.5 mi	Calcium, NY
ZIP code 13605	10 mi	Adams, NY
ZIP code 13659	11 mi	Lorraine, NY

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 13603, plotted from its record coordinates.

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

Scope ZIP code 13603. 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.