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U.S. Congress: District & state info
Info by and about the U.S. Congress - how to find laws (already passed & being considered) hearings & testimony, speeches given on the House & Senate, & info about members (biographical, $$, etc.)
Basic population (age, gender, ancestry, education...), economic (income, poverty, main industries...) & other data, for each district (and county), with comparisons to the U.S. "average."
Almost all Census 2000 data, and American Community Survey (smaller, more current population samples) can be limited or sorted by congressional district. Start at a "get data" link