POPULATION OF THE 100 LARGEST CITIES AND OTHER URBAN PLACES IN THE UNITED STATES: 1790 TO 1990 (Campbell Gibson)
City Population from Germany -- a VERY nice site for recent data on world cities
links for national statistics bureaus
Demographic Yearbook (city map)
FIPS codes for countries and subunits
Capital cities and cities of 100,000 and more inhabitants
most populated cities in the world
Cities at the Forefront (summary article)