ZIP Code 66778

66778 is one of Kansas's ZIP codes, delivering to addresses in Treece, Cherokee County.

City: Treece
County: Cherokee County
State: Kansas
Prefix: 667xx

Where this code sits

66778 is part of the 667xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Treece.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 66778 delivers to without sharing its boundary.

620 Area code 620

ZIP codes nearest 66778

The ZIP codes whose reference points sit closest to 66778.
ZIP code	Distance	Delivers to
ZIP code 74335	1.7 mi	Cardin, OK
ZIP code 74360	1.9 mi	Picher, OK
ZIP code 74339	5.0 mi	Commerce, OK
ZIP code 66713	5.9 mi	Baxter Springs, KS
ZIP code 74358	6.1 mi	North Miami, OK
ZIP code 74363	7.4 mi	Quapaw, OK
ZIP code 74354	8.7 mi	Miami, OK
ZIP code 66770	8.8 mi	Riverton, 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 66778, plotted from its record coordinates.

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

Scope ZIP code 66778. 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.