Alameda County, California
Alameda County is a county located in the U.S. state of California. As of the 2020 census, the population was 1,682,353, making it the 7th-most populous county in the state and 21st most populous nationally. The county seat is Oakland. Alameda County is in the San Francisco Bay Area, occupying much of the East Bay region.
The Spanish word alameda means either "a grove of poplars...or a tree lined street". The name was originally used to describe the Arroyo de la Alameda; the willow and sycamore trees along the banks of the river reminded the early Spanish explorers of a road lined with trees.
Alameda County is part of the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area, and the San Jose–San Francisco–Oakland, CA Combined Statistical Area.
History
The county was formed on March 25, 1853, from a large portion of Contra Costa County and a smaller portion of Santa Clara County.The county seat at the time of the county's formation was located at Alvarado, now part of Union City. In 1856, it was moved to San Leandro, where the county courthouse was destroyed by the devastating 1868 quake on the Hayward Fault. The county seat was then re-established in the town of Brooklyn from 1872 to 1875. Brooklyn is now part of Oakland, which has been the county seat since 1873.
Much of what is now an intensively urban region was initially developed as a trolley car suburb of San Francisco in the late 19th and early 20th centuries. The Key System moved commuters to and from the Key System Mole, where ferries bridged the gap across San Francisco Bay.
The historical progression from Native American tribal lands to Spanish then Mexican ranches, then to farms, ranches, and orchards, then to multiple city centers and suburbs, is shared with the adjacent and closely associated Contra Costa County.
Law, government and politics
Government
The Government of Alameda County is defined and authorized under the California Constitution, California law, and the Charter of the County of Alameda. Much of the Government of California is in practice the responsibility of county governments such as the Government of Alameda County, while municipalities such as the City of Oakland and the City of Berkeley provide additional, often non-essential services. The County government provides countywide services such as elections and voter registration, law enforcement, jails, vital records, property records, tax collection, and public health. In addition it is the local government for all unincorporated areas, and provides services such as law enforcement to some incorporated cities under a contract arrangement.It is composed of the elected five-member Alameda County Board of Supervisors as the county legislature, several other elected offices and officers including the Sheriff, the District Attorney, Assessor, Auditor-Controller/County Clerk/Recorder, Treasurer/Tax Collector, and numerous county departments and entities under the supervision of the County Administrator. In addition, several entities of the government of California have jurisdiction conterminous with Alameda County, such as the Alameda County Superior Court.
The current supervisors are:
- David Haubert, district 1,
- Elisa Márquez, district 2,
- Lena Tam, district 3,
- Nate Miley, district 4, and
- Keith Carson, district 5.
The county's law enforcement is overseen by an elected Sheriff/Coroner and an elected District Attorney. The Sheriff supervises the deputies of the Alameda County Sheriff's Office, whose primary responsibilities include policing unincorporated areas of the county and cities within the county which contract with the Sheriff's Office for police services; providing security and law enforcement for county buildings including courthouses, the county jail and other county properties; providing support resources, such as a forensics laboratory and search and rescue capabilities, to other law enforcement agencies throughout the county; and serving the process of the county's Superior Court system. The District Attorney's office is responsible for prosecuting all criminal violations of the laws of the state of California, the county, or its constituent municipalities, in the Alameda County Superior Court. The current Sheriff is Yesenia Sanchez, who was elected in 2022, succeeding Greg Ahern, who had served in the post for 16 years. The Sheriff's Office operates two jails: Santa Rita Jail in Dublin, and Glenn E. Dyer Detention Facility in downtown Oakland.
In 2009, Nancy E. O'Malley was appointed Alameda County district attorney after Tom Orloff retired. She served two terms and did not run for reelection in 2022. Pamela Price was elected as district attorney in 2022.
The Alameda County Fire Department was formed on July 1, 1993, as a dependent district, with the Board of Supervisors as its governing body. Municipal and specialized fire departments have been consolidated into the ACFD over the years. 1993 brought in the Castro Valley and Eden Consolidated FD, and the County Fire Patrol. San Leandro joined in 1995, Dublin in 1997, Lawrence Berkeley National Laboratory in 2002, Lawrence Livermore National Laboratory in 2007, The Alameda County Regional Emergency Communications Center in 2008, and Newark and Union City in 2010. Emeryville joined the ACFD in 2012.
The Alameda County Water District is a special district within Alameda County created to distribute water, but it is not operated by Alameda County administrators. It is operated by an elected board of directors.
Alameda County Superior Court operates in twelve separate locations throughout the county, with its central René C. Davidson Courthouse located in Oakland near Lake Merritt. Most major criminal trials and complex civil cases are heard at this location or in courtrooms within the County Administration Building across the street.
State and federal representation
In the California State Assembly, Alameda County is split between five districts:Politics
On November 4, 2008, Alameda County voted 61.92% against Proposition 8, which won statewide, and which amended the California Constitution to ban same-sex marriage. The county garnered the sixth highest "no" vote, by percentage, of all California counties, and was the second largest county, by total voter turnout, to vote against it.
Voter registration statistics as of October 24, 2022
Cities by population and voter registration
Geography and climate
According to the U.S. Census Bureau, the county has a total area of, of which is land and is water. The San Francisco Bay borders the county on the west.The crest of the Berkeley Hills forms part of the northeastern boundary and reaches into the center of the county. A coastal plain several miles wide lines the bay; and is Oakland's most populous region. Livermore Valley lies in the eastern part of the county. Amador Valley abuts the western edge of Livermore Valley and continues west to the Pleasanton Ridge. The ridges and valleys of the Diablo Range, containing the county's highest peaks, cover the very sparsely populated southeast portion of the county.
The Hayward Fault, a major branch of the San Andreas Fault to the west, runs through the most populated parts of Alameda County, while the Calaveras Fault runs through the southeastern part of the county.
The areas near the Bay itself have a maritime warm-summer Mediterranean climate, whereas behind the mountains, summers are significantly warmer. The climate charts below are for Oakland and inland Livermore.
Adjacent counties
The City and County of San Francisco, California, borders the county on the west, and has a small land border with the city of Alameda, California due to land filling.Santa Clara County borders the county on the south.
San Joaquin County borders the county on the east.
Contra Costa County borders the county on the north.
Stanislaus County borders the county on the easternmost end of its southern boundary for.
National protected area
2020 census
As of the 2020 census, the county had a population of 1,682,353. The median age was 37.7 years, 20.4% of residents were under the age of 18, and 14.3% of residents were 65 years of age or older. For every 100 females there were 96.1 males, and for every 100 females age 18 and over there were 94.0 males age 18 and over.The racial makeup of the county was 31.1% White, 9.8% Black or African American, 1.2% American Indian and Alaska Native, 32.4% Asian, 0.8% Native Hawaiian and Pacific Islander, 13.3% from some other race, and 11.3% from two or more races. Hispanic or Latino residents of any race comprised 23.4% of the population. The 2020 census shows Alameda as having one of the highest Asian percentages and being one of two counties in the continental US, along with neighboring Santa Clara County, California, to have an Asian plurality - consisting largely of Chinese, Indian and Filipino ancestry.
99.5% of residents lived in urban areas, while 0.5% lived in rural areas.
There were 591,636 households in the county, of which 33.0% had children under the age of 18 living with them and 26.5% had a female householder with no spouse or partner present. About 24.1% of all households were made up of individuals and 9.0% had someone living alone who was 65 years of age or older.
There were 621,958 housing units, of which 4.9% were vacant. Among occupied housing units, 51.8% were owner-occupied and 48.2% were renter-occupied. The homeowner vacancy rate was 0.8% and the rental vacancy rate was 4.8%.