Part-1: United States (US) House of Representatives Seats by State

The first Congress (1789-91) had 65 House members, the number provided for in the Constitution until the first census could be held. Based on an estimated population for the 13 states of 3.7 million, there was one representative for every 57,169 people. :(Source: Pew Research)

Presently, there are 435 house seats that spread across 50 states as a proportion of their population. The 1929 law authorizing that census also capped the size of the House at 435.

In 1929, the population of the United States was 121 million. In 2017, the population is 325 million. The house seats remain the same for the last 80 years.

Montana’s 1,050,493 people have just one House member; Rhode Island has slightly more people (1,059,639), but that’s enough to give it two representatives; one for every 529,820 Rhode Islanders.

State	Population	Representatives	Population/Representative
Montana	1,050,493	1	1,050,493
Delaware	961,939	1	961,939
South Dakota	869,666	1	869,666
Idaho	1,716,943	2	858,472
Oregon	4,142,776	5	828,555

States with largest population.

State	Population	Representatives	Population/Representative
California	39,536,653	53	745,975
Texas	28,304,596	36	786,239
Florida	20,984,400	27	777,200
New York	19,849,399	27	735,163
Pennsylvania	12,805,537	18	711,419
Illinois	12,802,023	18	711,224

States with only one house seat.

State	Population	Representatives	Population/Representative
Montana	1,050,493	1	1,050,493
Delaware	961,939	1	961,939
South Dakota	869,666	1	869,666
North Dakota	755,393	1	755,393
Alaska	739,795	1	739,795
Vermont	623,657	1	623,657
Wyoming	579,315	1	579,315