Platbookmapper County GIS Directory

County GIS · Parcel viewers · October 18, 2026

California County GIS Websites: Parcel Viewers by County

Which parcel map software each California county uses (58 of 58 verified), how to search the common viewers, and a link to every official map.

Looking for California county GIS websites? California has 58 counties, and their official parcel maps do not all run on the same software. Knowing which viewer a county uses tells you what the search box expects and where the parcel report is.

If you look up land in more than one California county, you will notice the parcel maps don't match. That is because each office chooses its own software. Below, all 58 California entries in our directory are listed with the viewer each one uses, plus tips for the most common types.

California at a glance

The most populous counties

The busiest offices are worth knowing first, since most searches land there.

Name 2023 population Viewer
Los Angeles County 9,663,345 county web map
San Diego County 3,269,973 ArcGIS Map Viewer
Orange County 3,135,755 county web map
Riverside County 2,492,442 county web map
San Bernardino County 2,195,611 county web map

How to search the most common viewers in California

county web map (24 entries, e.g. Contra Costa County, Kern County, Los Angeles County)

  1. Open the county's own web map.
  2. Search for the property or pan and zoom to it.
  3. Click the lot to bring up what the county publishes about it.
  4. Look for print or measure tools if you need a quick map or rough size.

ArcGIS Web AppBuilder (15 entries, e.g. Alameda County, Butte County, Calaveras County)

  1. Open the official map link from the county's page. The viewer is built with ArcGIS Web AppBuilder; if a disclaimer pops up, accept it to continue.
  2. Use the search widget, usually in the upper left, to find a street address or parcel ID.
  3. Click a parcel to open its info window.
  4. The widget bar holds extras such as the layer list, basemap switcher, measure and print tools.

ArcGIS Experience Builder (12 entries, e.g. Amador County, Del Norte County, El Dorado County)

  1. Open the link. This viewer is an ArcGIS Experience Builder app, so its layout is custom to the publisher.
  2. Look for a search box or search widget and type in a street address or parcel ID.
  3. Click a parcel to see its details in a pop-up or side panel.
  4. Check the toolbar for a layer list or basemap switcher if you want aerials or other layers.

Every California entry and its viewer

Name Seat 2023 population Official viewer type
Alameda County Oakland 1,622,188 ArcGIS Web AppBuilder
Alpine County Markleeville 1,141 ArcGIS
Amador County Jackson 41,811 ArcGIS Experience Builder
Butte County Oroville 207,172 ArcGIS Web AppBuilder
Calaveras County San Andreas 46,565 ArcGIS Web AppBuilder
Colusa County Colusa 22,037 ArcGIS Web AppBuilder
Contra Costa County Martinez 1,155,025 county web map
Del Norte County Crescent City 26,589 ArcGIS Experience Builder
El Dorado County Placerville 192,215 ArcGIS Experience Builder
Fresno County Fresno 1,017,162 ArcGIS Web AppBuilder
Glenn County Willows 28,129 ArcGIS Instant Apps
Humboldt County Eureka 133,985 ArcGIS Experience Builder
Imperial County El Centro 179,057 ArcGIS Web AppBuilder
Inyo County Independence 18,527 ArcGIS Web AppBuilder
Kern County Bakersfield 913,820 county web map
Kings County Hanford 152,682 ArcGIS Web AppBuilder
Lake County Lakeport 67,878 ArcGIS Web AppBuilder
Lassen County Susanville 28,861 ArcGIS Experience Builder
Los Angeles County Los Angeles 9,663,345 county web map
Madera County Madera 162,858 ArcGIS Web AppBuilder
Marin County San Rafael 254,407 county web map
Mariposa County Mariposa 16,919 ArcGIS Experience Builder
Mendocino County Ukiah 89,108 ArcGIS Map Viewer
Merced County Merced 291,920 county web map
Modoc County Alturas 8,500 county web map
Mono County Bridgeport 13,066 county web map
Monterey County Salinas 430,723 county web map
Napa County Napa 133,216 ArcGIS Web AppBuilder
Nevada County Nevada City 102,037 ArcGIS Experience Builder
Orange County Santa Ana 3,135,755 county web map
Placer County Auburn 423,561 ArcGIS Experience Builder
Plumas County Quincy 19,131 county web map
Riverside County Riverside 2,492,442 county web map
Sacramento County Sacramento 1,584,288 county web map
San Benito County Hollister 68,175 ArcGIS Experience Builder
San Bernardino County San Bernardino 2,195,611 county web map
San Diego County San Diego 3,269,973 ArcGIS Map Viewer
San Francisco County San Francisco 808,988 county web map
San Joaquin County Stockton 800,965 county web map
San Luis Obispo County San Luis Obispo 281,639 county web map
San Mateo County Redwood City 726,353 county web map
Santa Barbara County Santa Barbara 441,257 ORMAP
Santa Clara County San Jose 1,877,592 county web map
Santa Cruz County Santa Cruz 261,547 county web map
Shasta County Redding 180,366 ArcGIS Map Viewer
Sierra County Downieville 3,200 county web map
Siskiyou County Yreka 42,905 ArcGIS Experience Builder
Solano County Fairfield 449,218 ArcGIS Web AppBuilder
Sonoma County Santa Rosa 481,812 county web map
Stanislaus County Modesto 551,430 ArcGIS Web AppBuilder
Sutter County Yuba City 97,948 county web map
Tehama County Red Bluff 64,896 county web map
Trinity County Weaverville 15,670 ArcGIS Experience Builder
Tulare County Visalia 479,468 ArcGIS Web AppBuilder
Tuolumne County Sonora 54,204 ArcGIS Web AppBuilder
Ventura County Ventura 829,590 county web map
Yolo County Woodland 220,544 ArcGIS Experience Builder
Yuba County Marysville 85,722 ArcGIS Map Viewer

Before you rely on what you find

Treat these maps as a starting point. Parcel outlines are tax-map drawings and can be off from the true line; the recorded deed and a licensed survey are what count. To check flood zones, soils or wetlands for a spot you found, open it on the Platbookmapper Land Map, which pulls FEMA, USDA and U.S. Fish & Wildlife layers.

See also: California on Platbookmapper.

Related guides

Sources