The 840 area code is a telephone area code serving the far-eastern part of Los Angeles County, southwestern San Bernardino County, and a small portion of Riverside County in California. To start a free reverse phone lookup, simply enter the full 10-digit number (including the 840 area code) below and access available caller information such as name, address, and more.
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Area code 840 covers a region in Southern California, specifically including portions of Los Angeles County, San Bernardino County, and Riverside County.
Area code 840 is an overlay to area code 909. This means that both area codes serve the same geographic region. Area code 909 was created in 1992, and area code 840 was added in 2021. Ten-digit dialing is required for all calls in this region.
Area code 840 is a General Purpose Code which was placed in service on January 1, 1947.
Our reverse phone lookup will analyze the three-digit prefix of any 840 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, California geographic region, and local calling area associated with the phone number.
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