Census 2000 Data for Massachusetts
The first data releases from the 2000 Census for the state. Most of the data is for the state as a whole.

EconData.Net
Over 950 links to socioeconomic data providers, organized by subject and provider.

Massachusetts Commonwealth Communities site
Links to every municipalities' official webpage and DHCD community profile.

Massachusetts Department of Revenue Municipal Data Bank
A broad collection of data on every municipality. Both the Community Report Builder and the Municipal Spreadsheets are very useful.

Massachusetts Division of Employment and Training
Employment, labor force, and unemployment data for the state, as well as local employment data for every municipality from 1985 to 2000.

Massachusetts Division of Employment and Training MassStats
Economic data aggregated by county, region, labor market and service delivery areas.

Massachusetts Institute of Social and Economic Research (MISER)
A wide collection of data, mostly generated from census data from 1990 and 2000, available in several formats.