California Area Codes, United States

Find the real owner of someone with a 209 and 213, 310, 323, 341, 408 and 415, 424, 442, 510, 530, 559, 562, 619 and 858, 626, 650, 661, 707, 714, 760, 805, 831 and 818, 909, 916, 925, 949, 951 California area codes

California area code

California joined the Union in 1850. The most populous state in the United States has nearly 40 million residents and 35 California area codes connect these residents. An area code tells you the general city or town of a caller. However, more information on an unknown caller is only available with a phone number search on a California phone numbers database

In the early age of mobile communication, callers needed a human operator to connect them. This method was flawed for many reasons.

First, it could not support California’s population growth since there were few operators. Even though operators worked fast, they were often overwhelmed at busy times, and callers had to wait in line – something you do not want to do, especially for emergency calls. More importantly, calls were not private because an operator could listen in on conversations. Telephone companies discouraged this practice, but enforcing callers’ privacy was hard.

Soon enough, these difficulties paved the way for California area codes based on the North American Numbering Plan

An area code is a three-digit code that represents a small geographical area within California.

Think of a phone number as a physical address and consider a typical Sacramento phone number, 916-CYY-XXXX. 916 is the area code representing a city or town within California – in this case, Sacramento. The next three digits, CYY, are the prefix code, which would mean the street name. Finally, XXXX, the line number, would be the call recipient’s house number.

There were only three California area codes in 1947. A population explosion caused the state has created thirty-five (35) area codes using overlay and geographic split. These methods let residents retain old area codes while creating new area codes for new phone owners.

Besides connecting you with the person you wish to call, you can tell a caller’s city or town by merely looking at the California area code. You will also know if the call came from a landline or mobile phone by looking at the area code. A reverse phone search takes it further and lets you see the caller’s personal information and public records.

County FIPS code County seat Established Population Area
Alameda County001Oakland18531,671,329738 sq mi
Alpine County003Markleeville18641,129739 sq mi
Amador County005Jackson185439,752606 sq mi
Butte County007Oroville1850219,1861,640 sq mi
Calaveras County009San Andreas185045,9051,020 sq mi
Colusa County011Colusa185021,5471,151 sq mi
Contra Costa County013Martinez18501,153,526720 sq mi
Del Norte County015Crescent City185727,8121,008 sq mi
El Dorado County017Placerville1850192,8431,712 sq mi
Fresno County019Fresno1856999,1015,963 sq mi
Glenn County021Willows189128,3931,315 sq mi
Humboldt County023Eureka1853135,5583,573 sq mi
Imperial County025El Centro1907181,2154,175 sq mi
Inyo County027Independence186618,03910,192 sq mi
Kern County029Bakersfield1866900,2028,142 sq mi
Kings County031Hanford1893152,9401,390 sq mi
Lake County033Lakeport186164,3861,258 sq mi
Lassen County035Susanville186430,5734,558 sq mi
Los Angeles County037Los Angeles185010,039,1074,060 sq mi
Madera County039Madera1893157,3272,138 sq mi
Marin County041San Rafael1850258,826520 sq mi
Mariposa County043Mariposa185017,2031,451 sq mi
Mendocino County045Ukiah185086,7493,509 sq mi
Merced County047Merced1855277,6801,929 sq mi
Modoc County049Alturas18748,8413,944 sq mi
Mono County051Bridgeport186114,4443,044 sq mi
Monterey County053Salinas1850434,0613,322 sq mi
Napa County055Napa1850137,744754 sq mi
Nevada County057Nevada City185199,755958 sq mi
Orange County059Santa Ana18893,175,692948 sq mi
Placer County061Auburn1851398,3291,407 sq mi
Plumas County063Quincy185418,8072,554 sq mi
Riverside County065Riverside18932,470,5467,208 sq mi
Sacramento County067Sacramento18501,552,058966 sq mi
San Benito County069Hollister187462,8081,389 sq mi
San Bernardino County071
San Bernardino
18532,180,08520,062 sq mi
San Diego County073San Diego18503,338,3304,204 sq mi
San Francisco075San Francisco1850881,54947 sq mi
San Joaquin County077Stockton1850762,1481,399 sq mi
San Luis Obispo County079San Luis Obispo1850283,1113,304 sq mi
San Mateo County081Redwood City1856766,573449 sq mi
Santa Barbara County083Santa Barbara1850446,4992,738 sq mi
Santa Clara County085San Jose18501,927,8521,291 sq mi
Santa Cruz County087Santa Cruz1850273,213446 sq mi
Shasta County089Redding1850180,0803,786 sq mi
Sierra County091Downieville18523,005953 sq mi
Siskiyou County093Yreka185243,5396,287 sq mi
Solano County095Fairfield1850447,643828 sq mi
Sonoma County097Santa Rosa1850494,3361,576 sq mi
Stanislaus County099Modesto1854550,6601,495 sq mi
Sutter County101Yuba City185096,971603 sq mi
Tehama County103Red Bluff185665,0842,951 sq mi
Trinity County105Weaverville185012,2853,179 sq mi
Tulare County107Visalia1852466,1954,824 sq mi
Tuolumne County109Sonora185054,4782,236 sq mi
Ventura County111Ventura1872846,0061,846 sq mi
Yolo County113Woodland1850220,5001,012 sq mi
Yuba County115Marysville185078,668630 sq mi