US Census Tracks the Nation's Occupations

"The Census 2000 file contains data on the number of people employed in nearly 500 occupations, from actors to veterinarians. Data cover gender, race, ethnicity, education, age, industry and earnings. In addition, users may find where workers live, where they work and how many who work in one place live somewhere else.

Summary geographic levels include the nation, states, metropolitan areas, counties and places with populations of 50,000 or more."