Facts about San Mateo County, California
San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. The county seat is Redwood City. San Mateo County is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay.
GeographyAccording to the U.S. Census Bureau, the county has a total area of 741 square miles (1,920 km²), of which 448 square miles (1,160 km²) is land and 293 square miles (760 km²) (40%) is water.
DemographicsThe 2010 United States Census reported that San Mateo County had a population of 718,451.
Serving San Mateo 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.