That's kind of odd, that Mass. isn't included. I wonder what happened there.

tricolon · on July 14, 2015

The Census Bureau is rather vague about that:

> All 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands have joined the LED Partnership, although the LEHD program is not yet producing public-use statistics for Massachusetts, Puerto Rico, or the U.S. Virgin Islands.

http://lehd.ces.census.gov/

TillE · on July 14, 2015

> (Massachusetts has not submitted data to the Census Bureau as of this date)

Presumably not some legal restriction, then. They simply haven't provided the data.

http://lehd.ces.census.gov/research/