The number of representatives that a state sends to the U.S. House of Representatives depends on the size of the state's population. The total number of representatives remains fixed at 435, and states get more or fewer representatives as their population increases or decreases relative to other states.
At the time of the First Congress in 1789, there were only 13 states and a total of 65 representatives, each of whom represented 30,000 citizens. As the new country expanded, the number of representatives also expanded, and the size of their constituencies began to grow as well. By 1815, there were 83 representatives in Congress, and by 1911, there were 391. At this time, Congress passed the Apportionment Act of 1911. This act capped the size of the House of Representatives at 435 seats.
In 1929, the Congress passed the Reapportionment Act of 1929, which set the procedures for reapportionment. As a result of this law, the number of representatives per state fluctuates depending on its population in relation to that of other states as determined by the decennial U. S. Census. As of 2014, the state with the largest number of representatives is California, with 53, while Vermont, Wyoming, South Dakota, North Dakota and Delaware, the smallest states, have one representative apiece. As of 2010, there were an average of 710,767 constituents in every House district, though in some states with small populations, the number is much lower. Wyoming, for example, has only 568,000 residents.