How many people are in each House of Representatives Congressional district?

Originally each district was to consist of 33,000 people. By 1911 the number of districts had risen to 435 and the House was becoming unwieldy. It was decided to cap the total number of districts at that point and to instead reapportion them with each census so that they were roughly equal in size as the population grew and shifted.

As of 2007 each of those 435 Congressional districts has approximately 693,000 people living within it.