ZIP Code 66543

66543 is one of Kansas's ZIP codes, delivering to addresses in Vassar, Osage County.

City: Vassar
County: Osage County
State: Kansas
Prefix: 665xx

Where this code sits

66543 is part of the 665xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Vassar.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 66543 delivers to without sharing its boundary.

785 Area code 785

ZIP codes nearest 66543

The ZIP codes whose reference points sit closest to 66543.
ZIP code	Distance	Delivers to
ZIP code 66451	4.3 mi	Lyndon, KS
ZIP code 66528	5.6 mi	Quenemo, KS
ZIP code 66076	8.4 mi	Pomona, KS
ZIP code 66510	9.7 mi	Melvern, KS
ZIP code 66524	11 mi	Overbrook, KS
ZIP code 66523	12 mi	Osage City, KS
ZIP code 66537	13 mi	Scranton, KS
ZIP code 66414	13 mi	Carbondale, KS

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 66543, plotted from its record coordinates.

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

Scope ZIP code 66543. 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.