Homeless women prepare for a night spent on a street near Skid Row in Los Angeles, in May. Not every case of homelessness is so easy to spot as this, though; some groups say the Department of Housing and Urban Development numbers missed many people without stable housing. Frederic J. Brown/AFP/Getty Images hide caption

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Homeless people and their tents line a canal in Honolulu in June 2015. Hours after a city crew cleared the banks of the canal, the homeless people that had been living there moved right back to the riverside. Cathy Bussewitz/AP hide caption

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Pope Francis walks up the stairs at Andrews Air Force Base, Md., en route to New York, after visiting Washington where he spoke to a joint meeting of Congress and ate lunch with some 300 homeless people. Jacquelyn Martin/AP hide caption

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Jordan McClellan gets help making lunch from daughter Kyra Brooks in their apartment in Southeast Washington, D.C. McClellan has been fighting homelessness for most of her adult life, living in family shelters and transitional housing until she was moved into the rapid rehousing program. Lexey Swall/GRAIN for NPR hide caption

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Homeless families outside a downtown Seattle shelter. John Ryan/KUOW hide caption

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Tents are pitched illegally on a sidewalk in Seattle in January. The number of people sleeping outside in the city shot up by 20 percent in just the past year. David Ryder/Reuters/Landov hide caption

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The city of Hollywood, Fla., bought the Homeless Voice shelter from its owner, a longtime advocate for the homeless who agreed to stay away from the city for the next 30 years. Greg Allen hide caption

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Tony Simmons leads a group of Johns Hopkins University students on a "justice walk" in downtown Baltimore, during which they learn about public policy, providing services, and the connections between income inequality and health. Gabriella Demczuk for NPR hide caption

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Homeless advocate Arnold Abbott, 90, director of the nonprofit group Love Thy Neighbor Inc., prepares a salad Wednesday in the kitchen of The Sanctuary Church in Fort Lauderdale, Fla. Abbott was recently arrested, along with two pastors, for feeding the homeless in a Fort Lauderdale park. Lynne Sladky/AP hide caption

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