Blackhawk Ranch was established in 1917 by Ansel Mills Easton and his son-in-law William Q. Ward, in an area east of the San Ramon and Sycamore Valleys. The name came from a famous Irish racehorse named Blackhawk that Easton’s family had once owned. The land passed through the hands of several owners, including Raymond Force (the owner of the Caterpillar Tractor Company), the Hawaii-based sugar and pineapple company Castle & Cooke and Howard Peterson (owner of Peterson Tractor).

In 1975, Peterson sold the land to Florida developer Ken Behring, who planned a housing development of 4800 dwelling units over 4200 acres (17 km²) of land. Critics charged that the plan would have various negative impacts, related to urban sprawl, environmental damage and violations of the County General Plan. A group of environmentalists and local residents called Amigos de Diablo organized against the Blackhawk Development Corporation, but were sued for libel. The Blackhawk Development Corporation finally reduced the number of homes planned to 2400 and offered more than 2000 acres (8 km²) of open space to Mount Diablo State Park

Population: 9,354
Housing Units: 3,345
Source: US Census Bureau 2010 Census

Key Community Statistics
Selected Social Characteristics
Selected Economic Characteristics
Selected Housing Characteristics
Source: 2009-2013 American Community Survey

Local Services
Local Government
Board of Supervisor – Supervisor Mary Nejedly Piepho
Phone: (925) 252-4500

Fire and Safety
San Ramon Valley Fire Protection District
Non-emergency Phone: (925) 838-6640

Sheriff’s Dispatcher
Non-emergency Phone: (925) 646-2441

Blackhawk Sheriff’s Dispatch
Non-Emergency Phone (925) 736-1018

San Ramon Valley Unified School District