JOEL KOTKIN: Where American Families Are Moving.

Much is made, and rightfully so, about the future trends of America’s demographics, notably the rise of racial minorities and singles as a growing part of our population. Yet far less attention is paid to a factor that will also shape future decades: where families are most likely to settle.

However hip and cool San Francisco, Manhattan, Boston or coastal California may seem, they are not where families are moving.

In a new study by the Chapman Center for Demographics and Policy, we found that the best cities for middle-class families tend to be located outside the largest metropolitan areas. This was based on such factors as housing affordability, migration, income growth, commute times, and middle-income jobs. Many of our best-rated cities tend to mid-sized. The three most highly rated were Des Moines, Iowa, Madison, Wis., and Albany, N.Y., all with populations of less than 1 million. Among our top 10 metropolitan areas for families, five are larger than this, but only two—the Washington, D.C. area and Minneapolis-St. Paul—are among the nation’s 20 largest metropolitan areas.

Our bottom 10 includes the media’s favorite two cities, New York and Los Angeles, also the largest metropolitan areas in the nation. Three other large metropolitan areas rank in the bottom 10: Miami, Riverside-San Bernardino, Calif., and Las Vegas. The hipster cities, in other words, are not so amenable to the new generation of young families.

Hipsterville ain’t the kind of place to raise your kids. In fact, it’s expensive as hell. And that’s by design:

America has always had its fancy neighborhoods, often associated also with racial or ethnic exclusion. But increasingly large parts of the country, and this is true in certain cities and suburbs, are evolving into what Dartmouth University’s William Fischel has called “exclusionary regions”—too expensive for middle-class families to access.

Fischel traces much of this development to regulatory policies that restrict housing supply. In 1970, for example, housing affordability in coastal California metropolitan areas was similar to the rest of the country, as measured by the median multiple (the median house price divided by the median household income). Today, due in part to a generation of strict growth controls, home prices in places like San Francisco and Los Angeles are now three or more times higher than in some other metropolitan areas.

This has enriched the rich, at the expense of working families. Democrats supported it. Why don’t Republicans make an issue of it?