Massachusetts House of Representatives district map. Based on 2010 census.
United States Census Bureau
<p>US Census Bureau, 2018 State Legislative District Reference Maps / <a rel="nofollow" class="external free" href="https://www.census.gov/geographies/reference-maps/2018/geo/2018-state-leg-districts1.html">https://www.census.gov/geographies/reference-maps/2018/geo/2018-state-leg-districts1.html</a>
</p>
Lower Chamber Maps: Massachusetts / <a rel="nofollow" class="external free" href="https://www2.census.gov/geo/maps/dc10map/SLD_RefMap/lower/st25_ma/">https://www2.census.gov/geo/maps/dc10map/SLD_RefMap/lower/st25_ma/</a>