Statistics
City-Data: Huge amount of data on U.S. cities.
Data.gov: Home of the US government’s open data.
FedStats.gov: Provides access to the "full range of official statistical information produced by the Federal Government."
Los Angeles Almanac: Facts and statistics about Los Angeles County.
Census.gov: Website for US Census Bureau.
Worldometers: "Real-time" statistics on population, agriculture, economics, etc.
NationMaster: World statistics and country comparisons on "everything from obesity to murders."