The Alameda County Fairgrounds is a 270-acre (110 ha) facility located in Pleasanton, California.

It is home to the annual Alameda County Fair, held since 1912,[1] as well as numerous trade shows and community events.

Located on its grounds, the Pleasanton Fairgrounds Racetrack was built in 1858, making it the oldest one-mile (1.6 km) horse racing track in the United States.

[2] Building J, also known as the Amador Pavilion, is a multi-purpose arena and livestock event facility at the fairgrounds.

This article about a property in Alameda County, California on the National Register of Historic Places is a stub.