ZIP Code 73503

73503 is one of Oklahoma's ZIP codes, delivering to addresses in Fort Sill, Comanche County.

City: Fort Sill
County: Comanche County
State: Oklahoma
Prefix: 735xx

Where this code sits

73503 is part of the 735xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Fort Sill.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 73503 delivers to without sharing its boundary.

580 Area code 580

ZIP codes nearest 73503

The ZIP codes whose reference points sit closest to 73503.
ZIP code	Distance	Delivers to
ZIP code 73507	2.5 mi	Lawton, OK
ZIP code 73502	3.6 mi	Lawton, OK
ZIP code 73506	3.8 mi	Lawton, OK
ZIP code 73505	4.2 mi	Lawton, OK
ZIP code 73501	5.0 mi	Lawton, OK
ZIP code 73557	7.5 mi	Medicine Park, OK
ZIP code 73538	7.8 mi	Elgin, OK
ZIP code 73543	12 mi	Geronimo, OK

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 73503, plotted from its record coordinates.

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

Scope ZIP code 73503. 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.