Area code 209, Telephone prefix in Central Valley, California, United States.
Area code 209 is a telephone prefix serving portions of the San Joaquin Valley and Sierra foothills in central California. It covers larger towns such as Stockton and Modesto, along with smaller communities spread across several counties.
The prefix was established in 1957 when it separated from area code 415, which originally covered all of northern California. In 1998, the southern portion split off to form the new area code 559.
The telephone region encompasses both urban centers and agricultural communities, reflecting the diversity of Central California's population and economic activities.
All calls within this prefix zone require ten-digit dialing since 2021, including the prefix even for local numbers. This applies to both local and long-distance calls due to the overlay with area code 350.
The territory connects large farming areas with foothill towns that sit near the historic Gold Rush country of the Sierra Nevada. Despite its rural reach, it also includes densely populated urban centers along the river valley.
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