There are 4.3 million retail salespeople in the United States, equivalent to the state population of Kentucky. And there are 310 prosthodontists -- that is, dentists specializing in prosthetic teeth -- which is enough to fill, well, a medium-sized lecture hall.

Those are the most- and least-common occupations in the United States, according to a new survey from the Bureau of Labor Statistics. Here are the full top- (and bottom-) ten lists:

Three more interesting nuggets from the report.

(1) The most "urban" job in America -- that is, with the highest concentration in metro areas -- isn't technically a job in U.S. cities, but above U.S. cities. It's flight attendants.

(2) What's the most common government job? Depends on the level of government. At the federal level, it's a postal service workers. At state, it's a correctional officer or jailer. And at the local level, the top *five* most common occupations are all teachers.

(3) Shampooers are more likely to live in cities than software developers. Now you know. If you're interested in learning more about shampooers, this page is your new heaven.

Technical note: There are surely scarcer jobs than prosthodontists, it's just that the BLS doesn't count them. Take, for example, I don't know, rodeo clowns. How many rodeo clowns are there in America? I haven't the faintest idea. Neither does the BLS. Last year, it published a report on rodeo clowns, in which the author bravely admitted: "The U.S. Bureau of Labor Statistics does not collect employment or wage data on rodeo clowns." So to be precise, these are the least-populated job categories in the BLS Occupational Employment Statistics.

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