This is the same data set from the maps library, named differently

This database is of us cities of population greater than about 40,000. Also included are state capitals of any population size.

Format

A list with 6 components, namely "name", "country.etc", "pop", "lat", "long", and "capital", containing the city name, the state abbreviation, approximate population (as at January 2006), latitude, longitude and capital status indication (0 for non-capital, 1 for capital, 2 for state capital.