ZIP Code 95666

95666 is one of California's ZIP codes, delivering to addresses in Pioneer, Amador County.

City: Pioneer
County: Amador County
State: California
Prefix: 956xx

Where this code sits

95666 is part of the 956xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Pioneer.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 95666 delivers to without sharing its boundary.

ZIP codes nearest 95666

The ZIP codes whose reference points sit closest to 95666.
ZIP code	Distance	Delivers to
ZIP code 95689	3.5 mi	Volcano, CA
ZIP code 95665	4.8 mi	Pine Grove, CA
ZIP code 95255	5.3 mi	West Point, CA
ZIP code 95232	5.3 mi	Glencoe, CA
ZIP code 95257	6.9 mi	Wilseyville, CA
ZIP code 95248	7.0 mi	Rail Road Flat, CA
ZIP code 95245	8.1 mi	Mokelumne Hill, CA
ZIP code 95629	8.5 mi	Fiddletown, CA

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 95666, plotted from its record coordinates.

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

Scope ZIP code 95666. 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.