How the U.S. House Got Stuck at 435 Seats
The 435-seat cap was a 1929 truce, not a design. Detroit's two congressmen each represented nearly half a million people.
On June 18, 1929, Herbert Hoover signed a law that turned a temporary number into a permanent one. The House of Representatives would have 435 seats. It still does.
That number wasn't chosen for any principled reason. It was the size set after the 1910 census, and the size Congress had been arguing about for almost a decade. The 1920 census had handed Republicans a problem: rural districts were emptying, immigrants were piling into cities, and a normal reapportionment would have grown the House to about 483 seats while shifting power away from the rural members doing the math. So they refused. Between 1911 and 1929, no reapportionment happened at all — the only such gap in U.S. history.
By the end of that gap, Detroit's two congressmen each represented roughly 497,000 people, while the national average district held about 212,000. Senator Arthur Vandenberg's bill stopped the bleeding by setting an automatic formula tied to each new census, with the total fixed forever at 435.
The cap has been touched once, briefly: 437 seats from 1959 to 1963, after Alaska and Hawaii joined. Then it snapped back.
In 1910 the average House district had about 210,000 people. After the 2020 census, it had more than 761,000. Same chamber, same number of doors. More than three times as many constituents per vote.
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