Partisan Voting Index for Counties in California

This Map Displays the Partisan Voting Index Value for each county in California. The Partisan Voting Index (PVI) is a measurement of how strongly a county leans toward the Democratic or Republican Party. The PVI is calculated by taking the average percentage for the winning party in a county for the last two elections and subtracting that value from the national average for that party in the same two elections. The data is based on results from the 2020 and 2016 presidential election. Of the 58 Counties in California The County with the highest Republican PVI is Lassen County at +24. The County with the highest Democrat PVI is San Francisco County at +39.

Map List Related

Map of Partisan Voting Index (PVI) for Counties in California

Rep +20
Rep. 15-19
Rep. 10-14
Rep. 5-9
Rep. 1-4
Even
Dem 1-4
Dem 5-9
Dem 10-14
Dem 15-19
Dem +20

List of All Counties in California With Partisan Voting Index (2020 Presidential Election Results)

Map KeyNamePartisan Voting Index (2020)
Alameda CountyDemocrat +33
Alpine CountyDemocrat +13
Amador CountyRepublican +10
Butte CountyEven +0
Calaveras CountyRepublican +10
Colusa CountyRepublican +6
Contra Costa CountyDemocrat +24
Del Norte CountyRepublican +5
El Dorado CountyRepublican +3
Fresno CountyDemocrat +5
Glenn CountyRepublican +12
Humboldt CountyDemocrat +14
Imperial CountyDemocrat +18
Inyo CountyDemocrat +3
Kern CountyRepublican +4
Kings CountyRepublican +4
Lake CountyDemocrat +3
Lassen CountyRepublican +24
Los Angeles CountyDemocrat +25
Madera CountyRepublican +5
Marin CountyDemocrat +34
Mariposa CountyRepublican +8
Mendocino CountyDemocrat +16
Merced CountyDemocrat +7
Modoc CountyRepublican +22
Mono CountyDemocrat +10
Monterey CountyDemocrat +22
Napa CountyDemocrat +20
Nevada CountyDemocrat +5
Orange CountyDemocrat +6
Placer CountyRepublican +2
Plumas CountyRepublican +7
Riverside CountyDemocrat +5
Sacramento CountyDemocrat +13
San Benito CountyDemocrat +13
San Bernardino CountyDemocrat +7
San Diego CountyDemocrat +12
San Francisco CountyDemocrat +39
San Joaquin CountyDemocrat +8
San Luis Obispo CountyDemocrat +6
San Mateo CountyDemocrat +30
Santa Barbara CountyDemocrat +16
Santa Clara CountyDemocrat +26
Santa Cruz CountyDemocrat +30
Shasta CountyRepublican +15
Sierra CountyRepublican +8
Siskiyou CountyRepublican +6
Solano CountyDemocrat +16
Sonoma CountyDemocrat +25
Stanislaus CountyDemocrat +2
Sutter CountyRepublican +6
Tehama CountyRepublican +16
Trinity CountyEven +0
Tulare CountyRepublican +3
Tuolumne CountyRepublican +8
Ventura CountyDemocrat +11
Yolo CountyDemocrat +22
Yuba CountyRepublican +9

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