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Pleasanton is a city in Alameda County's Amador Valley that was established in 1869 on an 1839 Mexican land grant and incorporated on June 18, 1894.

Pleasanton was named by founder John W. Kottinger for his friend, Union Army Major General Alfred Pleasonton - the extra 'a' in the modern spelling came from a typographical error by a postal clerk in Washington.

Before Pleasanton, the earlier settlement of Alisal on the same site was nicknamed 'The Most Desperate Town in the West,' a refuge for Gold Rush-era bandits including Joaquin Murrieta; the 1844 Alviso Adobe from that era still stands as the centerpiece of Alviso Adobe Community Park.

Pleasanton had 79,871 residents at the 2020 census, living in about 27,877 households, with 67 percent of homes owner-occupied and a median owner-occupied home value of about $1.54 million.

Pleasanton was ranked the wealthiest middle-sized city in the United States by the Census Bureau in both 2005 and 2007.

Pleasanton is a corporate headquarters hub, home to the head offices of Safeway and Workday, along with companies such as Veeva Systems, Roche Molecular Diagnostics, and Blackhawk Network.

Pleasanton's 270-acre Alameda County Fairgrounds hosts the Alameda County Fair each year from late June into early July, and its racetrack is described as the oldest one-mile horse-racing track in the United States.

Pleasanton's Shadow Cliffs Regional Recreation Area offers a lake for swimming, fishing, and boating on the east side of town, while Pleasanton Ridge Regional Park and Augustin Bernal Park climb the hills on the west side.

Pleasanton was a filming location for the 1917 Mary Pickford film Rebecca of Sunnybrook Farm, and Phoebe Apperson Hearst's 50-room mansion estate in the hills is now the Castlewood Country Club.

Pleasanton lies along the route of the historic First Transcontinental Railroad, completed in 1869, the same year the town was established.