Modesto, CA is currently using one area code which is area code 209. Area code 209 was created from a split of area code 916 and put into service on January 1, 1958.
In addition to Modesto, CA area code 209 serves northern parts of the Central Valley area and the Sierra Foothills, including the larger communities of Atwater, Ceres, Lodi, Los Banos, Manteca, Merced, Modesto, Stockton, Tracy and Turlock in addition to many smaller communities.
Modesto, CA is located in Stanislaus County and observes the Pacific Time Zone. View our Times by Area Code tool.