US Census Bureau - A gold mine for data
Catalogue of Domestic Federal Assistance Programs - A listing of Domestic Assistance Programs.
FedWorld - A website to start your US Government info search
The National Association of Counties - great resource for local governments
County and Municipal Financial Compendium maintained by Local Affairs.
Colorado's Office of Planning and Budget - The state equivalent to OMB.
First Gov - US Government's Official Web Portal
Fedstats - statistics from over 100 federal agencies.
Colorado Department of Local Affairs - Data on local governments - see particularly Division of Local Government and CEDIS (Colorado Economic and Demographic Information System).
Nelson A. Rockefeller Institute of Government - Publications on Welfare, Jobs, Education, Medicaid and other topics.
Office of Management and Budget - the page on OMB circulars is worth the visit
State and Local Government on the Net - Directory of government resources.
Consolidated Federal Funds Report - Federal, state and local information.
Grants.gov - Electronically find and apply for grant opportunities from all Federal grant-making agencies.