Demographics Now/Academic Edition
Basic demographics data including consumer expenditures, population, income, race, housing, employment and Mosaic cluster groups by census tracts, block groups, zip code, county, state and entire U.S. with mapping features.

At a Glance Index of Cities and Towns in Massachusetts. 
Dept of Revenue creates city profiles which include current tax rates, revenues,expenditures as well as brief demographic information.  Drop down the menu on the bottom, left side and choose your community.

Commonwealth Communities.  
Data on each municipality's history, geography, government, demographics, housing characteristics, education, economic development, transportation,and much more.

MassBenchmarks State Data Center  
Massachusetts data from the Census, made available through MassBenchmarks, includes population, housing and social and economic data. 

American Fact Finder.
U.S. Bureau of the Census data including community profiles.

Boston Redevelopment Authority.  
Information includes: enrollment of college and university students in the Boston area for the last 10 years, the state of the Boston economy, the economic history for the last 30 years, and the daily change in population based on commuters, shoppers, tourists, etc.

 

Harvard Geospatial Library
Choose your own criteria and map cities/towns, counties by various themes.
 

See also Geographic Surveys (National).