The places most conducive to upward mobility include large cities — San Francisco, San Diego, Salt Lake City, Las Vegas and Providence, R.I. — and major suburban counties, such as Fairfax, Va.; Bergen, N.J.; Bucks, Pa.; Macomb, Mich.; Worcester, Mass.; and Contra Costa, Calif.
These places tend to share several traits, Mr. Hendren said. They have elementary schools with higher test scores, a higher share of two-parent families, greater levels of involvement in civic and religious groups and more residential integration of affluent, middle-class and poor families.
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The former home of the Polk family in Bellwood, Ill.  The fatal shooting of Latonya Polk's husband there prompted her to move away with her two children in search of a safer place. CreditAlyssa Schukar for The New York Times
For low-income families, a home in places with these characteristics is often a financial stretch. Rachelle Hawkins, a 32-year-old single mother in California, rented an apartment in Contra Costa late last year with help from a Contra Costa nonprofit called Shelter, Inc., which paid her first month’s rent. She moved from a gritty neighborhood near Oakland and was homeless for a time. She makes about $29,000 as a customer-service agent in online banking and faces an annual rent bill of almost $17,000.
But she thinks the burden is worth it for her children, who are 4 and 6. “I don’t think my kids are going to remember what we went through,” Ms. Hawkins said. “They are absolutely better off, just because of the environment.”
In addition to studying the outcomes of more than five million children who moved, Mr. Chetty and Mr. Hendren also revisited the subjects of the Moving to Opportunity experiment. Working with Lawrence Katz, one of the original researchers to study the program, they analyzed more recent, richer data — and concluded that children who moved before they were teenagers did indeed benefit economically. (The original study had found health benefits for both younger and older children.)
In both studies, the younger children were when they moved, the better they did. Children were less likely to become single parents when they grew up, were more likely to go to college and to earn more. The original research had not been able to follow the economic outcomes of younger children, because not enough time had passed, Mr. Katz said.
Still, the more extensive nationwide data on moving found that older children were also affected by their neighborhood. The effect was what statisticians call linear: Each additional year in a different place had roughly the same average effect on a child’s adult earnings. A teenager’s year in a better neighborhood mattered as much as a 9-year-old’s year — but 9-year olds still had their teenage years in front of them.
Some economists who have seen the new study say that it argues for a new approach to housing policy. Current policy often forces the parents of young children onto waiting lists for housing vouchers. It also gives tax incentives to developers who build in poor neighborhoods, rather than rewarding those who build affordable housing in areas that seem to offer better environments.
In an interview Friday, Julián Castro, the secretary of Housing and Urban Development, said he was excited by the new data. Mr. Castro said his department had been planning to reallocate funding, so that some people moving to more expensive neighborhoods would receive larger vouchers. Currently, the value of vouchers tends to be constant across a metropolitan area.
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The Polk family's new apartment, in Wood Dale, Ill., is small, but Mrs. Polk and her two teenage children are pleased with the calmer setting. CreditAlyssa Schukar for The New York Times
The large county on the other end of the spectrum from Baltimore, with the best odds of escaping poverty, is DuPage County, Ill., west of Chicago. It contains suburbs where the schools are considered better and where housing costs more than in Chicago and some close-in suburbs.
In 2012, Latonya Polk decided to move there with her son and daughter, then 16 and 15. Her husband had been fatally shot on the front lawn of their apartment outside Chicago in 2011, in a crime that remains unsolved, she said.
Briana, her daughter, was hesitant about leaving her friends, but Mrs. Polk insisted, saying they could still visit them. “I knew absolutely it would mean better possibilities for my kids,” she said.
Mrs. Polk earns about $40,000 a year at a company that helps clear goods through customs. She has been able to afford the move by living in a cramped $1,025-a-month, one-bedroom apartment — and with help from a county program that gives them about $2,000 a year toward living expenses.
Her son, Jovan, graduated from high school last year and is now working, while Briana will graduate this spring. Both plan to enroll in community college in the next year.
Although most places with better odds of escaping poverty have higher rent, the researchers did identify some counties as “upward-mobility bargains.” These include Putnam County, N.Y.; parts of the Pittsburgh and Altoona areas in Pennsylvania; and, if only relative to surrounding areas, Contra Costa.
The study defined low income as the 25th percentile of the income distribution — a household earning less than three-quarters of other households nationally, or about $30,000 a year for families with children. But the analysis covered the full income distribution, and the geographic patterns at the 25th percentile were very similar to those for poorer and somewhat less poor households.
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Mrs. Polk, center, with her son Jovan Nicholson and daughter Briana Nicholson at home in Wood Dale.CreditAlyssa Schukar for The New York Times
The main innovation of the new paper — part of the Equality of Opportunity Project, involving multiple researchers — is its focus on children who moved. Doing so allows the economists to ask whether the places themselves actually affect outcomes. The alternative is that, say, Baltimore happens to be home to a large number of children who would struggle no matter where they grew up.
The data suggests otherwise. The easiest way to understand the pattern may be the different effects on siblings, who have so much in common. Younger siblings who moved from a bad area to a better one earned more as adults than their older siblings who were part of the same move. The particular environment of a city really does seem to affect its residents.
The data does not answer the question of whether the factors that distinguish higher-mobility places, like better schools and less economic segregation, are causing the differences — or are themselves knock-on effects of other, underlying causes. “We still need clarity on that,” Mr. Grusky, the Stanford professor, said.
From her perspective, Ms. Hawkins, the Contra Costa resident, said that the mixing of people from different social classes did make a difference.
“It’s all spread out here,” she said. In her old home in San Leandro, Calif., entire neighborhoods had high unemployment and crime, which led some people who did have jobs to flee, causing a downward spiral. “You don’t want to put your kid in harm’s way. That’s just extra stress.”
For all the benefits that moves can bring, they are not a solution to poverty, said people who have seen the new paper as well as the researchers themselves. Finding ways to improve those neighborhoods, for people who cannot or do not want to move, is also important, researchers and policy makers said.
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