N.H. Const. pt. 2, art. 9
There shall be in the legislature of this state a house of representatives, biennially elected and founded on principles of equality, and representation therein shall be as equal as circumstances will admit. The whole number of representatives to be chosen from the towns, wards, places, and representative districts thereof established hereunder, shall be not less than three hundred seventy-five or more than four hundred. As soon as possible after the convening of the next regular session of the legislature, and at the session in 1971, and every ten years thereafter, the legislature shall make an apportionment of representatives according to the last general census of the inhabitants of the state taken by authority of the United States or of this state. In making such apportionment, no town, ward or place shall be divided nor the boundaries thereof altered.
June 2, 1784
Amended 1877 three times providing for biennial elections; increasing representation from 150 rateable polls to 600; prohibiting towns and wards from being altered so as to increase representation.
Amended 1942 limiting size of House to between 375 and 400.
Amended 1964 providing for equal representation.