States · California · Contra Costa County

Blackhawk, California.

A community in Contra Costa County, with no city government of its own. Zillow publishes no home prices for it: see Contra Costa County’s.

Living in Blackhawk, Contra Costa County, California

Blackhawk, in Contra Costa County, had 9,637 people in the 2020 census. Half its households earn more than $245,208 a year and half less, against $127,229 across Contra Costa County; 6% of its people live below the poverty line. 89% of its homes are lived in by their owners and 11% are rented. Unemployment in Contra Costa County was 5.0% in August 2026, and the county had 0.1% more jobs in 2025 than the year before. The most residents work in professional services, then schools and health care.

People 9,637 in the 2020 census; median age 50.3
Household income $245,208 the median, give or take $27,390 · Contra Costa County: $127,229
Unemployment 5.0% Contra Costa County, August 2026; 5.2% a year before
Homes 89% lived in by their owners; 11% rented
  • 3,781households
  • 70%of adults have a degree
  • 6%below the poverty line
  • 36 mintypical commute
  • 38%work from home

What residents work in

  • Professional and business services21%
  • Schools, hospitals and social care16%
  • Banks, insurance and property16%
  • Shops (retail)13%
  • Media and telecoms8%
  • Manufacturing7%

Employed residents by industry, from the Census survey. Contra Costa County had 374,448 jobs in 2025, 0.1% more than the year before (Bureau of Labor Statistics).

Weather through the year

Average daily high and low for each month: coldest in December, 53° and 41°; warmest in August, 83° and 61° 40° 50° 60° 70° 80° 90° J F M A M J J A 83° 61° S O N D 53° 41°
Average daily high and low for each month: coldest in December, 53° and 41°; warmest in August, 83° and 61° 40° 50° 60° 70° 80° 90° J F M A M J J A 83° 61° S O N D 53° 41°

Coldest in December, with highs near 53° and lows near 41°; warmest in August, with highs near 83° and lows near 61°. About 1 inches of snow and 26 inches of rain and melted snow a year.

Average daily high and low, 1991–2020, at the Mount Diablo Junction weather station, 5 miles away (NOAA).

Largest workplaces in Contra Costa County

  1. West Contra Costa UnifiedSchool district2,751FTE
  2. Contra Costa Regional Medical CenterGeneral hospital2,584FTE
  3. San Ramon Valley UnifiedSchool district2,519FTE
  4. 24 Hour Home CareSenior citizens centers2,496
  5. Mt. Diablo UnifiedSchool district2,466FTE
  6. John Muir Medical Center - WCGeneral hospital2,143FTE
  7. Antioch UnifiedSchool district1,552FTE
  8. JT Thorpe and SonRefractory fireproofing1,523

Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 573 workplaces with 20 or more staff, 81,677 people in all across the county; Blackhawk has one of its own. School districts come from the Common Core of Data (NCES, 2023–24) and hospitals from their Medicare cost reports (CMS, 2023); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.

Natural hazards

  1. EarthquakesRelatively high
  2. Landslidesrelatively high in parts of BlackhawkRelatively moderate
  3. Wildfirerelatively high in parts of BlackhawkRelatively moderate
  4. Inland floodingrelatively high in parts of BlackhawkRelatively moderate
  5. Heat wavesRelatively moderate

FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in Blackhawk’s census tracts, against the rest of the country; all of them together, relatively moderate. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.

From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Contra Costa County.