Policy Map is a web-based Geographic Information System that provides a simple mechanism for visualizing data. Available data includes demographics, home sale statistics, health data, mortgage trends, school performance scores and labor data like unemployment, crime statistics and city crime rates.
City Population - Population Statistics for Countries, Administrative Areas, Cities and Agglomerations – Interactive Maps and Charts
Eurostat Your key to European Statistics
Philadelphia Neighborhoods
Philadelphia Inquirer and DVrpc maps
Data.Census.gov
Current U.S. population, housing, economic and geographic data from the U.S. Census Bureau
Data.gov
Online gateway to statistics from over 100 Federal agencies