Pleasanton is a city in Alameda County, California, United States. Located in the Amador Valley, it is a suburb in the East Bay region of the San Francisco Bay Area. In 2005 and 2007, Pleasanton was ranked the wealthiest middle-sized city in the United States by the Census Bureau. Pleasanton is home to the headquarters of Safeway, Workday, Ellie Mae, Roche Molecular Diagnostics, Blackhawk Network Holdings, and Veeva Systems. Other major employers include Kaiser Permanente, Oracle and Macy’s. Although Oakland is the Alameda County seat, a few county offices are located in Pleasanton. The Alameda County Fairgrounds are located in Pleasanton, where the county fair is held during the last week of June and the first week of July. Pleasanton Ridge Regional Park is located on the west side of town.
Pleasanton experienced a major economic boom starting in the early 1980s, largely associated with the development of a number of business parks, the largest of which is the Hacienda Business Park. These host a number of campus-like clusters of low-rise and medium-rise office buildings. Pleasanton has been successful in attracting a number of corporate headquarters, such as those of Safeway, Blackhawk Network Holdings, Workday, Simpson Manufacturing, The Cooper Companies and Shaklee. Despite an increase in office space vacancy rates in 2000–2004, economic development has remained strong through the middle of the decade.