Mass. Gen. Laws ch. 53 § 44
The nomination of candidates for nomination at state primaries shall be by nomination papers. In the case of the governor, lieutenant-governor, attorney general and United States senator, nomination papers shall be signed in the aggregate by at least ten thousand voters; in the case of the state secretary, state treasurer and state auditor, they shall be signed by at least five thousand voters. Such papers for all other offices to be filled at a state election shall be signed by a number of voters as follows: for representative in congress, two thousand voters; for councillor, district attorney, clerk of courts, register of probate, register of deeds, county commissioner, sheriff and county treasurer, one thousand voters, except that in Barnstable, Berkshire, Franklin, and Hampshire counties such papers for nomination to the office of clerk of courts, register of probate, register of deeds, county commissioner, sheriff and county treasurer shall be signed by five hundred voters; for state senator, three hundred voters; for representative in the general court, one hundred and fifty voters. In Dukes and Nantucket counties such papers for nomination to all offices within the county to be filled at any state election shall be signed by twenty-five voters. In no event shall the number of signatures required be more than the number of a candidate for the same office in the same electoral district or division to have his name placed on the ballot as provided for under section six.
Mass. Gen. Laws ch. 53, § 44