[1] According to the U.S. Constitution, the number of seats in the U.S. House of Representatives was to be determined by population. The minimum for each state was set at one. [2] The 23rd Amendment added the special category of non-voting membership in the U.S. House. The number wasn't based on population. And it was fixed at one. That special category includes the commonwealth of Puerto Rico; the District of Columbia; and the territories of American Samoa, Guam, Northern Mariana Island, Samoa, and the U.S. Virgin Islands. [3] In addition, seven states have just one member each to the U.S. House. In the case of these states, though, each member is a voting representative. These states are Alaska, Delaware, Montana, North and South Dakota, Vermont, and Wyoming. [4] Be they from a state or from one of the special categories, each one's in the U.S. House as the result of direct election by the populations that they represent.