Data Sources

Parcel boundary data in Gold Prospector comes from county and state government GIS offices. Those agencies are credited below.

For what each map layer shows and where the rest of the data comes from, see the full layer catalog.

California (54 counties)

From each county's GIS or assessor office.

Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Glenn, Humboldt, Imperial, Inyo, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba

Oregon (26 counties)

From each county's GIS or assessor office.

Baker, Benton, Clatsop, Columbia, Coos, Crook, Curry, Deschutes, Douglas, Gilliam, Grant, Harney, Hood River, Jackson, Josephine, Klamath, Lake, Lane, Linn, Marion, Morrow, Tillamook, Umatilla, Union, Wasco, Wheeler

Washington (39 counties)

All 39 counties from WAGeoservices.

Adams, Asotin, Benton, Chelan, Clallam, Clark, Columbia, Cowlitz, Douglas, Ferry, Franklin, Garfield, Grant, Grays Harbor, Island, Jefferson, King, Kitsap, Kittitas, Klickitat, Lewis, Lincoln, Mason, Okanogan, Pacific, Pend Oreille, Pierce, San Juan, Skagit, Skamania, Snohomish, Spokane, Stevens, Thurston, Wahkiakum, Walla Walla, Whatcom, Whitman, Yakima

Arizona (14 counties)

Twelve counties from the Arizona Department of Water Resources, the rest from their own county offices.

Apache, Cochise, Coconino, Gila, Graham, Greenlee, La Paz, Maricopa, Mohave, Navajo, Pima, Pinal, Santa Cruz, Yuma

Required attribution

A few agencies ask to be credited a specific way.

• Sonoma County data must be credited as County of Sonoma.
• Napa, Yuba, Jackson County OR, Benton County OR and Navajo County AZ are published under CC BY 4.0.

A small number of counties publish through a regional agency such as a resource conservation district or transportation commission.

Parcel data is provided as-is by the agencies above. It is not survey-grade and should not be used to determine legal property boundaries.