www.SolanoCounty.com

Population & Census Data
  Solano County does not maintain or distribute census data. This service is provided by the Association of Bay Area Governments (ABAG) as part of an agreement with nine San Francisco Bay Area counties. ABAG has population, demographic, real estate, housing data and maps available on its web site at no charge. ABAG also produces a variety of reports which are available on-line at no charge.
ABAG Demographics data
Solano Economic Development Corporation (Solano EDC)