United States Census Bureau The ultimate place to find comprehensive and detailed demographic information on the United States. Now includes Census 2000 data. Pay attention to the browsable index "Subjects A to Z" and the categories on the home page. "American FactFinder" offers detailed demographic information on state, county, and city levels.
Foreign Trade Statistics http://www.census.gov/foreign-trade/statistics/country/index.html
State Export Data: http://www.census.gov/foreign-trade/statistics/state/index.html