D & B Million Dollar Database
D&B's North American Million Dollar Database provides the information professional, marketer and sales executive with information on approximately 1,600,000 U.S. and Canadian leading public and private businesses. Company information includes industry information with up to 24 individual 8-digit SICs, size criteria (employees and annual sales), type of ownership, principal executives and biographies. Big databases like this one use a lot of public information, so don't be surprised or disappointed if you find a few errors. It happens. Check out the family tree link in this one, it's an interesting feature. And save your work, you'll get timed out if idle for 20 minutes!