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The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
County FIPS code [8] County seat [9] Est. [9] Formed from Etymology [10] General Law or Charter [6] Population (2023) [11] Area [9] Map Alameda County: 001: Oakland: 1853: Contra Costa and Santa Clara: The oak and other trees, once abundant in the region; alameda is Spanish for "avenue shaded by trees" or "cottonwood grove". Charter 1,622,188: ...
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
According to the U.S. Census Bureau, the county has a total area of 20,105 square miles (52,070 km 2), of which 20,057 square miles (51,950 km 2) is land and 48 square miles (120 km 2) (0.2%) is water. [15] It is the largest county by area in California and the largest in the United States (excluding boroughs in Alaska). [16]
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. [37]
Orange County Area. Santa Ana-Anaheim-Irvine, CA. Santa Ana; South Coast Metro; Santa Ana Valley; Saddleback Valley; Santa Ana Mountains; San Diego–Tijuana. San Diego metropolitan area. North County. North County Coastal; North County Inland; Temecula Valley; East County. Mountain Empire; South Bay
The county has the largest Native American population of any U.S. county, originating mostly from Latin American countries. As estimated by the Public Policy Institute of California in 2008, Los Angeles County was home to more than one-third of California's undocumented immigrants, who made up more than ten percent of the population. [47]
San Diego County (/ ˌ s æ n d i ˈ eɪ ɡ oʊ / ⓘ), officially the County of San Diego, is a county in the southwest corner of the U.S. state of California, north to its border with Mexico. As of the 2020 census , the population was 3,298,634; [ 7 ] it is the second-most populous county in California and the fifth-most populous in the ...