Title: San Mateo County, California
Content:  San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2010 census, the population was 718,451. Redwood City is the county seat, and the third most populated city following Daly City and San Mateo. San Mateo County is included in the San Francisco-Oakland-Berkeley, CA MSA (metropolitan statistical area), Silicon Valley, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay. It covers most of the San Francisco Peninsula. San Francisco International Airport is located in the northeastern area of the county and is approximately 7 miles south of the city and county limits of San Francisco. The county's built-up areas are mostly suburban, and are home to several corporate campuses.
Title: San Mateo County, California
Content: Belmont ; Brisbane ; Burlingame ; Daly City ; East Palo Alto ; Foster City ; Half Moon Bay ; Menlo Park ; Millbrae ; Pacifica ; Redwood City (county seat) ; San Bruno ; San Carlos ; San Mateo ; South San Francisco 
Title: San Mateo, California
Content:  San Mateo is a city in San Mateo County, California, on the San Francisco Peninsula. About 20 miles (32 km) south of San Francisco, the city borders Burlingame to the north, Hillsborough to the west, San Francisco Bay and Foster City to the east and Belmont to the south. The population is 105,661 per the 2020 census. San Mateo has a Mediterranean climate and is known for its rich history at the center of the San Francisco Bay Area. Some of the biggest economic drivers for the city include technology, health care and education.
Title: San Mateo County, California
Content:  status as county seat was upheld in two successive elections in May 1861 and December 9, 1873, defeating San Mateo and Belmont. Another election in May 1874 named San Mateo the county seat, but the state supreme court overturned that election on February 24, 1875, and the county seat has remained at Redwood City ever since. San Mateo County bears the Spanish name for Saint Matthew. As a place name, San Mateo appears as early as 1776 in the diaries of Anza and Font. Several local geographic features were also designated San Mateo on early maps including variously: a settlement, an arroyo, a headland jutting into the Pacific (Point Montara), and a large land holding (Rancho San Mateo). Until about 1850, the name appeared as San Matheo.
Title: California Historical Landmarks in San Mateo County
Content: } 
Title: San Mateo, New Mexico
Content:  San Mateo is a census-designated place in Cibola County, New Mexico, United States. The population was 161 at the 2010 census. The community has a Catholic church, a Baptist church, a Morada, a cemetery, and an old abandoned elementary school. It is also coined "the Uranium Capital of the World".
Title: San Mateo County, California
Content:  The population ranking of the following table is based on the 2010 census of San Mateo County. † county seat
Title: San Mateo County, California
Content:  The 2010 United States Census reported that San Mateo County had a population of 718,451. The racial makeup of San Mateo County was 383,535 (53.4%) White, 20,436 (2.8%) African American, 3,306 (0.5%) Native American, 178,118 (24.8%) Asian (9.8% Filipino, 9.0% Chinese, 1.9% Indian, 1.2% Japanese, 0.8% Korean, 0.5% Vietnamese, 0.3% Burmese, 0.1% Pakistani), 10,317 (1.4%) Pacific Islander (0.6% Tongan, 0.3% Samoan, 0.2% Fijian, 0.1% Native Hawaiian), 84,529 (11.8%) from other races, and 38,210 (5.3%) from two or more races. Hispanic or Latino of any race were 182,502 persons (25.4%); 15.7% of San Mateo County is Mexican, 2.7% Salvadoran, 1.2% Guatemalan, 1.2% Nicaraguan, 0.7% Peruvian, 0.6% Puerto Rican, 0.2% Colombian, and 0.2% Cuban.
Title: San Mateo County, California
Content:  San Mateo County as following the south branch of San Francisquito Creek to its source in the Santa Cruz Mountains and thence due west to the Pacific Ocean, and named Redwood City as the county seat. San Mateo County then annexed part of northern Santa Cruz County in March 1868, including Pescadero and Pigeon Point. Although the formation bill named Redwood City the county seat, a May 1856 election marked by "unblushing frauds perpetuated on an unorganized and wholly unprotected community by thugs and ballot stuffers from San Francisco" named Belmont the county seat. The election results were declared illegal and the county government was moved to Redwood City, with land being donated from the original Pulgas Grant for the county government on February 27, 1858. Redwood 
Title: San Mateo Mesa (McKinley County, New Mexico)
Content:  San Mateo Mesa is located in McKinley County, New Mexico, approximately 5 miles northwest of San Mateo. There are two large mesas, called San Mateo Mesa South and San Mateo Mesa North.

Question: What is the capital of San Mateo County?
Answer: Redwood City.
Redwood City, California.