Using data from the 2011-2015 five-year file of the American Community Survey, this brief and set of detailed tables provide estimates of local uninsurance rates in Massachusetts. The appendices provide data on the estimates of the number and rate of uninsurance by the following categories: all persons, males, females, children (ages 0-17), non-elderly adults (ages 18-64), and elderly (ages 65+). Each appendix provides these results for a different geographic unit, including large areas such as congressional districts and smaller areas such as school districts.