Unemployment rates in all Bay Area counties in February were below the state's average, with Alameda County ending the month with a 5% rate.
Representatives of the State of California Employment Development Department (EDD) said the unemployment rate also was 5% in Napa County and closed the month at 5.3% in Contra Costa County.
The EDD made the announcement in conjunction with a report that California's unemployment rate dropped to 6.7% in February from 7% in January and 8% a year ago.
California employers added nearly 30,000 jobs last month.
San Mateo County's unemployment rate in February was the lowest among the nine Bay Area counties at 3.5%.
The unemployment rate in two other counties was also below 4%. The City and County of San Francisco's unemployment rate was 3.8% in February and the unemployment rate in Marin County was 3.7%.
Solano County had the highest rate in the Bay Area in February at 6.6%.