County Data Page: Government contact information, elected officials, some with email addresses, list of cities, links to census data. From the National Association of Counties.
County of Imperial: Official site
Imperial Irrigation District: Community-owned utility providing electric power and irrigation water to the lower southeastern portion of California's desert.
MapStats: Imperial County: County statistics collected by the Federal Interagency Council on Statistical Policy, including agriculture, census, business, crime, energy and environment, and general profile.
Profile for Imperial County: Includes government officials and county offices, list of cities in the county, population estimates, lookup for Federal campaign contributions, links to other information.
QuickFacts from the US Census Bureau: Quick overview of population and demographics, plus link to detailed population, demographic, economic and housing information based on census data from 1990 through 1998.
YBLost - Imperial County: Directory of government agencies and departments.