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Alameda County (/ ˌ æ l ə ˈ m iː d ə / ⓘ AL-ə-MEE-də) is a county located in the U.S. state of California.As of the 2020 census, the population was 1,682,353, [4] [6] making it the 7th-most populous county in the state [7] and 21st most populous nationally.
Concord (/ ˈ k ɒ ŋ k ər d / KON-kerd) [10] is the most populous city in Contra Costa County, California, United States.According to an estimate completed by the United States Census Bureau, the city had a population of 122,315 in 2023, [11] making it the tenth most populous city in the San Francisco Bay Area.
English: This is a locator map showing Alameda County in California. For more information, see Commons:United States county locator maps. Date: 12 February 2006:
The Bay Area consists of nine counties (Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma) and 101 municipalities. [5] One, San Francisco, is a consolidated city–county. California law makes no distinction between "city" and "town", and municipalities may use either term in their official names. [6]
The region has grown to include inland communities in Alameda and Contra Costa counties. [1] With a population of roughly 2.8 million in 2024, it is the most populous subregion in the Bay Area, containing the second- and third-most populous Bay Area counties of Alameda (1.7 million) and Contra Costa (1.1 million). [2]
916/279 — Sacramento County and the Sacramento suburbs in western Placer and El Dorado Counties. One of the three original area codes in California, formerly covered all areas now within 530. 925 — Outer East Bay (Concord, Pittsburg, Walnut Creek, San Ramon, Pleasanton and Livermore). Originally part of area codes 415 and 510. [34]
The numbering plan area includes southeastern Alameda County (Dublin, Pleasanton, Livermore, Sunol, and unincorporated areas surrounding those communities), and all of Contra Costa County except the western part (El Cerrito to Crockett). Prior to October 2021, area code 925 had telephone numbers assigned for the central office code 988.
The district encompasses most of Contra Costa County, including Concord, Antioch, Pittsburg, Bay Point, Martinez, Pleasant Hill, Walnut Creek, Lafayette, Danville, San Ramon, and Orinda; along with Castro Valley, San Lorenzo, and San Leandro in Alameda County.