Go to:

• EconData.net
• American FactFinder (search by U.S. county)
• Statistical Abstract of the United States
• Bureau of Economic Analysis (BEA) Regional Economic Accounts

Much of the economic statistics in Proquest Statistical Insight can be disaggregated to the state and county levels.

Also; see the following texts:

• County and City Data Book: Online and in print (call number 317.3 un3Co)
• The Statesman's Year-book-- (call number 310 St2)
• Statistical Abstract of the United States--(call number 317 Un3s)

For Federal Reserve Bank (FRB) regional district data; go to The Beige Book.