People holding umbrellas walk through New York City's Times Square in 2019. The U.S. Census Bureau plans to change how it protects the confidentiality of people's information in the detailed demographic data it produces through the 2020 count. Mary Altaffer/AP hide caption
Workers in China collect demographic data in the the seventh population census on Nov. 1, 2020. TPG/Getty Images hide caption
Minnesota's state demographer, Susan Brower (center), walks with Dean Goldberg, donning a blue cape and black mask as "Census Man," through the 2019 Minnesota State Fair in St. Paul, Minn., to encourage residents to participate in the national head count. Victor Thorstenson/Minnesota Department of Administration hide caption
Some states have gained or lost Electoral College votes because of changes in population numbers recorded by the 2020 census. Zach Levitt/NPR hide caption
U.S. Army soldiers board a bus in January 2020 at Fort Bragg, N.C., one of the military bases that will likely see population boosts in their 2020 census counts due to a change to how troops deployed abroad were counted. Chris Seward/AP hide caption
House Speaker Nancy Pelosi (right) speaks outside the U.S. Capitol in March with other members of the U.S. House of Representatives, the size of which has stayed at 435 voting members for decades. Eric Baradat/AFP via Getty Images hide caption
Weeks before the 1980 census officially began, the Federation for American Immigration Reform launched its campaign to exclude unauthorized immigrants from population counts that, according to the Constitution, must include the "whole number of persons in each state." Ernie Leyba/The Denver Post via Getty Images hide caption
The 2020 census has been disrupted by the coronavirus pandemic, historic hurricane and wildfire seasons, last-minute schedule changes, and President Trump's call to leave unauthorized immigrants out of a key census count. David L. Ryan/The Boston Globe via Getty Images hide caption
Commerce Secretary Wilbur Ross, who oversees the Census Bureau, waits for a House Oversight and Reform Committee hearing to begin in Washington, D.C., in 2019. In July, Ross directed bureau officials to speed up the 2020 census to end counting a month early, on Sept. 30. Andrew Harrer/Bloomberg via Getty Images hide caption
U.S. Census Director Steven Dillingham departs a Sept. 17 news conference in Phoenix. The Trump administration is facing two federal lawsuits over its last-minute decision to cut the 2020 census schedule short. Ross D. Franklin/AP hide caption
The Trump administration has announced its third new political appointee in less than two months at the U.S. Census Bureau, which is headquartered in Suitland, Md. Claire Harbage/NPR hide caption
Demonstrators rally outside the U.S. Supreme Court in April 2019 to protest against the Trump administration's efforts to add the now-blocked citizenship question to the 2020 census. J. Scott Applewhite/AP hide caption
President Trump departs a July 2019 press conference on the census with U.S. Attorney General William Barr (center) and Commerce Secretary Wilbur Ross in the White House Rose Garden. Alex Wong/Getty Images hide caption
Starting July 23, the Census Bureau says door knockers will make in-person visits to households that have not yet filled out a 2020 census form in parts of Connecticut, Indiana, Kansas, Pennsylvania, Virginia and Washington. Andrew Harrer/Bloomberg via Getty Images hide caption