Facts about Contra Costa County, California
Contra Costa County is a county in the state of California in the United States. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area, and is primarily suburban.
GeographyAccording to the U.S. Census Bureau, the county has a total area of 804 square miles (2,080 km²), of which 716 square miles (1,850 km²) is land and 88 square miles (230 km²) (11%) is water.
DemographicsThe 2010 United States Census reported that Contra Costa County had a population of 1,049,025.
Serving Contra Costa County, California

Bio-One services all types of trauma, distressed property, and biohazard scenes in communities throughout East Bay Area. We partner with local authorities, communities, emergency services personnel, victim services groups, hoarding task forces, apartment complexes, insurance companies and others to provide the most efficient and superior service possible.
We are your crime scene cleaners dedicated to assisting law enforcement, public service agencies and property owners/managers in restoring property that has been contaminated as a result of crime, disaster or misuse.
- We have fielded thousands of calls and recovered just about any situation out there in a professional and compassionate matter.
- We are Licensed, Bonded, and Insured.
- We maintain strict adherence to OSHA rules and regulations to ensure the safety of our workers, the public, and of you and your family.
- We are proud to have a great working relationship with the Police, Fire, and most Insurance Agencies.