Census 2010 Block Data is Now Available From NRIS
A shapefile of Montana’s 2010 Census Blocks, with selected population data from the 2010 Redistricting database, is available at http://nris.mt.gov/nsdi/nris/shape/cblock2010.zip. A list of the population fields that come with the data is at http://nris.mt.gov/nsdi/nris/cblock2010.html#Entity_and_Attribute_Information.
The shapefile for the entire state is 190 megabytes. You may clip the data for smaller areas with the GIS Data Bundler at http://nris.mt.gov/gis/bundler or view the data with our Digital Atlas at http://nris.mt.gov/mapper.