Los Alamos is a census-designated place (CDP) in Santa Barbara County, California, United States. Although located in the Los Alamos Valley, the town of Los Alamos is usually considered to be a part of the Santa Ynez Valley community. The population was 1,372 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (6.1 km²), all of it land.
Los Alamos is located near the Santa Ynez Valley, on U.S. Route 101. It is a small, unincorporated town surrounded primarily with ranches, vegetable farms (broccoli, lettuce and strawberries), and wine grape vineyards.
Los Alamos is relatively isolated. It is about 10 miles (16 km) to Buellton, California and Los Olivos, California to the southeast, and Santa Maria, California to the northwest along Highway 101. Lompoc, California and Vandenberg Air Force Base are also to the northwest.
At the 2000 census, there were 1,372 people, 471 households and 349 families residing in the CDP. The population density was 582.8 per square mile (225.4/km²). There were 488 housing units at an average density of 207.3/sq mi (80.2/km²). The racial makeup of the CDP was 76.90% White, 0.22% African American, 1.82% Native American, 0.73% Asian, 0.51% Pacific Islander, 15.09% from other races, and 4.74% from two or more races. Hispanic or Latino of any race were 34.69% of the population.
There were 471 households of which 44.2% had children under the age of 18 living with them, 58.0% were married couples living together, 11.3% had a female householder with no husband present, and 25.9% were non-families. 20.4% of all households were made up of individuals and 6.8% had someone living alone who was 65 years of age or older. The average household size was 2.91 and the average family size was 3.36.
Age distribution was 31.9% under the age of 18, 7.7% from 18 to 24, 34.2% from 25 to 44, 19.3% from 45 to 64, and 7.0% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 102.7 males. For every 100 females age 18 and over, there were 96.0 males.
The median household income was $47,321, and the median family income was $49,125. Males had a median income of $32,206 versus $30,714 for females. The per capita income for the CDP was $18,013. About 10.3% of families and 13.1% of the population were below the poverty line, including 18.2% of those under age 18 and 2.2% of those age 65 or over.
The main street in Los Alamos is Bell Street, or California Route 135. Many businesses line the street, like the historic Victorian Mansion Bed & Breakfast, which houses six masterfully themed suites, or the Union Hotel, an old Wells Fargo stagecoach stop. The local elementary school, Olga Reed School, is located next to Los Alamos County Park. The second park in Los Alamos is Arthur Ferrini Park, located next to the U.S Post Office. Many locals walk or ride their bicycles around town. Los Alamos Old Days is a celebration held in September annually on Bell Street. Los Alamos Old Days is usually three days long and offers stands and booths and a parade that celebrates the agriculture and history aroung Los Alamos Valley, the Valley of the Cottonwoods. In fact "Los Alamos" in Spanish means "The Cottonwoods".
Los Alamos is located off the U.S 101 about 10 miles north of Buellton, and 15 miles south of Santa Maria. Los Alamos is approximately 155 miles north of Los Angeles.