Tracy is the second most populated city in San Joaquin County, California, United States. The population was 93,000 at the 2020 census. Tracy is located inside a geographic triangle formed by Interstate 205 upon the north side of the city, Interstate 5 to the east, and Interstate 580 to the southwest.

Until the 1760s, the area that is now the city of Tracy was long populated by the Yokuts ethnic intervention of loosely associated bands of Native Americans and their ancestors. They lived upon hunting and amassing foods, game and fish from the area, including its local rivers and creeks. After encountering the Spanish colonists, the Yokuts suffered from new infectious diseases, which caused social disruption, as did the Spanish efforts to impress them for labor at missions, specifically Mission San Jose. Mexican and American explorers forward-looking came into the area, pushing the Yokuts out. The Yokuts people are yet around to this day and bring to life in little groups following a sum of nearly 2,600 people identifying under the Yokuts name. Along considering the Yokuts, another language society of Native Americans found near the Tracy area are referred to as the Mono. Today the Mono peoples numbers are just about 1,800 people.

Tracy is a railroad town that came from the mid-19th century construction, mainly by Chinese laborers, of Central Pacific Railroad rail lines giving out from Sacramento through Stockton to the San Francisco Bay Area, beginning 1868 and ending September 1878 taking into account the start of a additional branch and junction. A number of small communities sprang taking place along these lines at designated station sites, including one at the junction named for railroad director J. J. Tracy.

Incorporated in 1911, Tracy grew unexpectedly and prospered as the middle of an agricultural area, even afterward larger railroad operations began to decline in the 1950s. Competition following trucking and automobiles resulted in widespread railroad restructuring. Tracy is allocation of the San Jose-San Francisco-Oakland, CA Combined Statistical Area, an enlargement of the Bay Area.