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The US Census data layers are available from MassGIS. The portion for Newton was clipped for internal staff use. The statewide layer can be downloaded here. The description below is from the MassGIS web site:
MassGIS has processed a portion of the U.S. Census Bureau's 2010 data release for Massachusetts in order to assist GIS users who may need access to these demographic-related datasets. These data are only suitable for use with Census 2010 products and should NOT be linked to geography or tables from the Census 2000 release.
Census geographic areas, or units, are used by the Bureau to collect and tabulate decennial census data. Three levels are available from MassGIS (with layer name in parentheses) in the following hierarchy:
Related tables from the Census Bureau’s Summary File 1 are also available. These link to the GIS files with the LOGECNO field. MassGIS created "user-friendly" subsets of these tables: dBase tables (32 MB) | Access 2003 databases (26 MB)