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Welcome to Contra Costa County ...

Time Zone: Contra Costa County lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time.

The community of Martinez is the Seat for Contra Costa County.

Contra Costa County is one of the original counties of California and was founded in 1850.

From the Census Estimates for 2019, <1> Contra Costa had a population of 1,153,526 people. This is an increase of 9.59% since the last Census (which gave a population of 1,052,540 people in 2010).

At the time of the 2010 Census, Contra Costa represented 2.83% of the total population of California.

Below are some of the communities located in Contra Costa County:

  • Antioch
    (14 miles [22.5 km] to the east)
    • Antioch is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Antioch
    • Population from the 2020 Census: 111,605 people
    • Jump to TripAdvisor's Tourism page for Antioch <2>
  • Brentwood
    (19 miles [30.6 km] to the east)
    • Brentwood is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Brentwood
    • Population from the 2020 Census: 65,017 people
    • Jump to TripAdvisor's Tourism page for Brentwood <2>
  • Clayton
    (6 miles [9.7 km] to the east)
    • Clayton is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Clayton
    • Population from the 2020 Census: 11,527 people
    • Jump to TripAdvisor's Tourism page for Clayton <2>
  • Concord
    (2 miles [3.2 km] to the north)
    • Concord is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Concord
    • Population from the 2020 Census: 128,544 people
    • Jump to TripAdvisor's Tourism page for Concord <2>
  • Danville
    (8 miles [12.9 km] to the south)
    • Danville is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Danville
    • Population from the 2020 Census: 44,883 people
    • Former name for Danville:
    • Inmanville
    • Jump to TripAdvisor's Tourism page for Danville <2>
  • El Cerrito
    (13 miles [20.9 km] to the west)
    • El Cerrito is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for El Cerrito
    • Population from the 2020 Census: 25,403 people
    • Jump to TripAdvisor's Tourism page for El Cerrito <2>
  • Hercules
    (13 miles [20.9 km] to the west)
    • Hercules is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Hercules
    • Population from the 2020 Census: 26,221 people
    • Jump to TripAdvisor's Tourism page for Hercules <2>
  • Lafayette
    (4 miles [6.4 km] to the southwest)
    • Lafayette is located in Contra Costa County (CA)
    • Jump to our Gazetteer entry for Lafayette
    • Population from the 2020 Census: 25,992 people
    • Jump to TripAdvisor's Tourism page for Lafayette <2>
  • Continue List   (11 more) ...
    • Martinez
      (6 miles [9.7 km] to the northwest)
      • Martinez is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Martinez
      • Population from the 2020 Census: 38,027 people
      • Jump to TripAdvisor's Tourism page for Martinez <2>
    • Moraga
      (8 miles [12.9 km] to the southwest)
      • Moraga is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Moraga
      • Population from the 2020 Census: 16,967 people
      • Former name for Moraga:
      • Willow Springs
      • Jump to TripAdvisor's Tourism page for Moraga <2>
    • Oakley
      (19 miles [30.6 km] to the east)
      • Oakley is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Oakley
      • Population from the 2020 Census: 42,710 people
      • Jump to TripAdvisor's Tourism page for Oakley <2>
    • Orinda
      (8 miles [12.9 km] to the southwest)
      • Orinda is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Orinda
      • Population from the 2020 Census: 19,557 people
      • Jump to TripAdvisor's Tourism page for Orinda <2>
    • Pinole
      (13 miles [20.9 km] to the west)
      • Pinole is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Pinole
      • Population from the 2020 Census: 19,207 people
      • Jump to TripAdvisor's Tourism page for Pinole <2>
    • Pittsburg
      (11 miles [17.7 km] to the northeast)
      • Pittsburg is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Pittsburg
      • Population from the 2020 Census: 72,622 people
      • Jump to TripAdvisor's Tourism page for Pittsburg <2>
    • Pleasant Hill
      (Less than 2 miles to the north)
    • Richmond
      (15 miles [24.1 km] to the west)
      • Richmond is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for Richmond
      • Population from the 2020 Census: 110,038 people
      • Jump to TripAdvisor's Tourism page for Richmond <2>
    • San Pablo
      (15 miles [24.1 km] to the west)
      • San Pablo is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for San Pablo
      • Population from the 2020 Census: 30,779 people
      • Jump to TripAdvisor's Tourism page for San Pablo <2>
    • San Ramon
      (12 miles [19.3 km] to the southeast)
      • San Ramon is located in Contra Costa County (CA)
      • Jump to our Gazetteer entry for San Ramon
      • Population from the 2020 Census: 82,865 people
      • Jump to TripAdvisor's Tourism page for San Ramon <2>
    • Walnut Creek
      (2 miles [3.2 km] to the south)

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.