ZIP Code 66538

66538 is one of Kansas's ZIP codes, delivering to addresses in Seneca, Nemaha County.

City: Seneca
County: Nemaha County
State: Kansas
Prefix: 665xx

Where this code sits

66538 is part of the 665xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Seneca.

Seneca Kansas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 66538 delivers to without sharing its boundary.

785 Area code 785

ZIP codes nearest 66538

The ZIP codes whose reference points sit closest to 66538.
ZIP code	Distance	Delivers to
ZIP code 66522	5.0 mi	Oneida, KS
ZIP code 66404	8.2 mi	Baileyville, KS
ZIP code 66408	8.5 mi	Bern, KS
ZIP code 66415	9.8 mi	Centralia, KS
ZIP code 66534	12 mi	Sabetha, KS
ZIP code 66403	13 mi	Axtell, KS
ZIP code 66417	13 mi	Corning, KS
ZIP code 66428	13 mi	Goff, 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 66538, plotted from its record coordinates.

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

Scope ZIP code 66538. 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.