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Contra Costa County

1,167,984 Population
732,464 Voters

Contra Costa County

1,167,984 Population
732,464 Voters

Unlock full voter and turnout data for Contra Costa Voter counts, turnout history, and demographics—ready for your next briefing in minutes, not hours.

Population Overlap

Contra Costa County
Total Population 1,167,984
180 overlapping jurisdictions
12 jurisdiction types
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Cities

19 jurisdictions
City of Antioch Ron Bernal
9.9% of this county
100.0% of the city
City of Antioch - District 1 Tamisha Torres-Walker
2.5% of this county
100.0% of the subdistrict
2.5% of this county
100.0% of the subdistrict
2.6% of this county
100.0% of the subdistrict
2.4% of this county
100.0% of the subdistrict
City of Brentwood Susannah Meyer
5.5% of this county
100.0% of the city
1.4% of this county
100.0% of the subdistrict
City of Brentwood - District 2 Pa'tanisha Pierson
1.4% of this county
100.0% of the subdistrict
1.4% of this county
100.0% of the subdistrict
1.3% of this county
100.0% of the subdistrict
1.0% of this county
100.0% of the city
10.8% of this county
100.0% of the city
City of Concord - District 1 Laura Hoffmeister
2.1% of this county
100.0% of the subdistrict
2.3% of this county
100.0% of the subdistrict
2.2% of this county
100.0% of the subdistrict
2.1% of this county
100.0% of the subdistrict
2.1% of this county
100.0% of the subdistrict
3.7% of this county
100.0% of the city
2.2% of this county
99.9% of the city
2.2% of this county
100.0% of the city
2.2% of this county
100.0% of the city
City of Martinez Brianne Zorn
3.2% of this county
100.0% of the city
0.8% of this county
100.0% of the subdistrict
0.8% of this county
100.0% of the subdistrict
City of Martinez - District 3 Satinder S. Malhi
0.8% of this county
100.0% of the subdistrict
0.8% of this county
100.0% of the subdistrict
1.5% of this county
100.0% of the city
3.7% of this county
100.0% of the city
0.8% of this county
100.0% of the subdistrict
0.7% of this county
100.0% of the subdistrict
0.8% of this county
100.0% of the subdistrict
0.7% of this county
100.0% of the subdistrict
0.7% of this county
100.0% of the subdistrict
1.7% of this county
100.0% of the city
1.6% of this county
100.0% of the city
6.6% of this county
100.0% of the city
3.0% of this county
100.0% of the city
0.6% of this county
100.0% of the subdistrict
0.6% of this county
100.0% of the subdistrict
0.6% of this county
100.0% of the subdistrict
0.6% of this county
100.0% of the subdistrict
0.6% of this county
100.0% of the subdistrict
City of Richmond Eduardo Martinez
10.0% of this county
100.0% of the city
1.7% of this county
100.0% of the subdistrict
1.6% of this county
100.0% of the subdistrict
1.7% of this county
100.0% of the subdistrict
1.7% of this county
100.0% of the subdistrict
1.7% of this county
100.0% of the subdistrict
1.7% of this county
100.0% of the subdistrict
2.7% of this county
100.0% of the city
City of San Ramon Mark Armstrong
7.4% of this county
99.9% of the city
1.8% of this county
100.0% of the subdistrict
1.9% of this county
99.7% of the subdistrict
1.9% of this county
100.0% of the subdistrict
1.8% of this county
100.0% of the subdistrict
6.0% of this county
100.0% of the city

State Assembly

4 jurisdictions
11th Assembly District Lori D. Wilson (D)
5.7% of this county
12.8% of the AD
14th Assembly District Buffy Wicks (D)
23.3% of this county
57.1% of the AD
15th Assembly District Anamarie Ávila Farías (D)
43.9% of this county
100.0% of the AD
16th Assembly District Rebecca Bauer-Kahan (D)
27.2% of this county
61.6% of the AD

State Senate

3 jurisdictions
3rd State Senate District Christopher Cabaldon (D)
11.2% of this county
12.7% of the SD
7th State Senate District Jesse Arreguín (D)
23.3% of this county
28.3% of the SD
9th State Senate District Tim Grayson (D)
65.5% of this county
77.1% of the SD

Congressional (2022)

3 jurisdictions
60.4% of this county
92.8% of the CD
38.1% of this county
58.6% of the CD
1.5% of this county
2.3% of the CD

Congressional (2026)

3 jurisdictions
58.3% of this county
89.5% of the CD
23.4% of this county
35.9% of the CD
18.4% of this county
28.2% of the CD

Board of Equalization

1 jurisdiction
100.0% of this county
11.7% of the district

School Districts

18 jurisdictions
10.2% of this county
100.0% of the district
10.3% of this county
100.0% of the district
Antioch Unified - District 1 Antonio Hernandez
2.1% of this county
100.0% of the trustee area
2.1% of this county
100.0% of the trustee area
2.0% of this county
100.0% of the trustee area
Antioch Unified - District 4 Olga Cobos-Smith
2.0% of this county
100.0% of the trustee area
Antioch Unified - District 5 Mary Helen Rocha
2.1% of this county
100.0% of the trustee area
5.8% of this county
100.0% of the district
1.3% of this county
100.0% of the district
0.0% of this county
100.0% of the district
1.3% of this county
100.0% of the district
0.4% of this county
100.0% of the district
2.5% of this county
100.0% of the district
10.9% of this county
100.0% of the district
Liberty Union High - District 1 Yolanda Peña-Mendrek
2.2% of this county
100.0% of the trustee area
2.2% of this county
100.0% of the trustee area
2.2% of this county
100.0% of the trustee area
2.2% of this county
100.0% of the trustee area
2.2% of this county
100.0% of the trustee area
2.7% of this county
100.0% of the district
0.5% of this county
100.0% of the trustee area
Martinez Unified - District 2 Anne Horack Martin
0.5% of this county
100.0% of the trustee area
0.6% of this county
100.0% of the trustee area
Martinez Unified - District 4 Courtney Masella-O'Brien
0.5% of this county
100.0% of the trustee area
0.5% of this county
100.0% of the trustee area
1.5% of this county
100.0% of the district
22.9% of this county
100.0% of the district
4.6% of this county
100.0% of the trustee area
4.6% of this county
100.0% of the trustee area
4.6% of this county
100.0% of the trustee area
4.6% of this county
100.0% of the trustee area
4.6% of this county
100.0% of the trustee area
3.5% of this county
100.0% of the district
0.7% of this county
100.0% of the trustee area
0.7% of this county
100.0% of the trustee area
0.7% of this county
100.0% of the trustee area
0.7% of this county
100.0% of the trustee area
0.7% of this county
100.0% of the trustee area
1.7% of this county
100.0% of the district
5.5% of this county
100.0% of the district
14.0% of this county
100.0% of the district
2.6% of this county
100.0% of the trustee area
2.9% of this county
100.0% of the trustee area
2.8% of this county
100.0% of the trustee area
2.8% of this county
100.0% of the trustee area
2.9% of this county
99.8% of the trustee area
4.6% of this county
100.0% of the district
22.2% of this county
99.9% of the district
4.4% of this county
100.0% of the trustee area
4.4% of this county
100.0% of the trustee area
4.5% of this county
100.0% of the trustee area
4.3% of this county
100.0% of the trustee area
4.6% of this county
99.6% of the trustee area

Community College

1 jurisdiction
100.0% of this county
100.0% of the CCD
20.0% of this county
99.9% of the trustee area
20.0% of this county
100.0% of the trustee area
20.2% of this county
100.0% of the trustee area
20.0% of this county
100.0% of the trustee area
19.6% of this county
100.0% of the trustee area

Supervisor Districts

5 jurisdictions
20.2% of this county
99.9% of the district
21.0% of this county
100.0% of the district
19.0% of this county
100.0% of the district
20.8% of this county
100.0% of the district
County of Contra Costa - District 5 Shanelle Scales-Preston
19.0% of this county
100.0% of the district

County Board of Ed

1 jurisdiction
100.0% of this county
100.0% of the district
20.2% of this county
99.9% of the trustee area
19.6% of this county
100.0% of the trustee area
19.4% of this county
100.0% of the trustee area
19.6% of this county
100.0% of the trustee area
21.2% of this county
100.0% of the trustee area

Neighborhoods

5 jurisdictions
0.0% of this county
4.0% of the neighborhood
0.0% of this county
2.1% of the neighborhood
0.0% of this county
2.4% of the neighborhood
0.0% of this county
2.5% of the neighborhood
0.0% of this county
2.3% of the neighborhood

Unincorporated Communities

34 jurisdictions
0.1% of this county
100.0% of the community
1.3% of this county
100.0% of the community
0.1% of this county
100.0% of the community
2.1% of this county
100.0% of the community
0.2% of this county
100.0% of the community
0.2% of this county
100.0% of the community
0.8% of this county
100.0% of the community
0.1% of this county
100.0% of the community
0.4% of this county
100.0% of the community
0.1% of this county
100.0% of the community
0.1% of this county
100.0% of the community
0.6% of this county
100.0% of the community
0.3% of this county
100.0% of the community
0.1% of this county
100.0% of the community
1.3% of this county
100.0% of the community
0.3% of this county
100.0% of the community
1.3% of this county
100.0% of the community
0.5% of this county
98.0% of the community
0.1% of this county
100.0% of the community
0.3% of this county
100.0% of the community
0.2% of this county
100.0% of the community
0.1% of this county
99.8% of the community
0.1% of this county
100.0% of the community
0.4% of this county
100.0% of the community
0.4% of this county
100.0% of the community
0.0% of this county
100.0% of the community
0.3% of this county
100.0% of the community
0.8% of this county
100.0% of the community
0.3% of this county
100.0% of the community
0.3% of this county
100.0% of the community
0.5% of this county
100.0% of the community
0.1% of this county
100.0% of the community
0.5% of this county
100.0% of the community
0.4% of this county
100.0% of the community
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