The American middle class is losing ground in metropolitan areas across the country, affecting communities from Boston to Seattle and from Dallas to Milwaukee. From 2000 to 2014 the share of adults living in middle-income households fell in 203 of the 229 U.S. metropolitan areas examined in a new Pew Research Center analysis of government data. The decrease in the middle-class share was often substantial, measuring 6 percentage points or more in 53 metropolitan areas, compared with a 4-point drop nationally.

The shrinking of the middle class at the national level, to the point where it may no longer be the economic majority in the U.S., was documented in an earlier analysis by the Pew Research Center. The changes at the metropolitan level, the subject of this in-depth look at the American middle class, demonstrate that the national trend is the result of widespread declines in localities all around the country.

This report encompasses 229 of the 381 “metropolitan statistical areas” as defined by the federal government. Together, these areas accounted for 76% of the nation’s population in 2014.

With relatively fewer Americans in the middle-income tier, the economic tiers above and below have grown in significance over time. The share of adults in upper-income households increased in 172 of the 229 metropolitan areas, even as the share of adults in lower-income households rose in 160 metropolitan areas from 2000 to 2014.

Among American adults overall, including those from outside the 229 areas examined in depth, the share living in middle-income households fell from 55% in 2000 to 51% in 2014. Reflecting the accumulation of changes at the metropolitan level, the nationwide share of adults in lower-income households increased from 28% to 29% and the share in upper-income households rose from 17% to 20% during the period.

The widespread erosion of the middle class took place against the backdrop of a decrease in household incomes in most U.S. metropolitan areas. Nationwide, the median income of U.S. households in 2014 stood at 8% less than in 1999, a reminder that the economy has yet to fully recover from the effects of the Great Recession of 2007-09.

A previous report from the Pew Research Center, released on Dec. 9, 2015, focused on national trends in the size and economic well-being of the American middle class from 1971 to 2015. That report demonstrated that the share of American adults in middle-income households shrank from 61% in 1971 to 50% in 2015. The national level estimates presented in the earlier report were derived from Current Population Survey (CPS) data. Thus, they differ slightly from the estimates in this report.

A distinct geographical pattern emerges with respect to which metropolitan areas had the highest shares of adults who were lower income, middle income or upper income in 2014. The 10 metropolitan areas with the greatest shares of middle-income adults are located mostly in the Midwest. Wausau, WI, where 67% of adults lived in middle-income households in 2014, had the distinction of leading the country on this basis, followed closely by Janesville-Beloit, WI (65%). Sheboygan, WI, and four other Midwest areas also placed among the top 10 middle-income areas.

Beyond a shared geography, the top 10 middle-income metropolitan areas are more rooted in manufacturing than the nation overall.

In about a quarter of the metropolitan areas in 2014, middle-class adults do not constitute a clear majority of the adult population. Notably, many of the nation’s largest metropolitan areas fall into this group, including Los Angeles-Long Beach-Anaheim, CA, where 47% of adults were middle income; San Francisco-Oakland-Hayward, CA (48%); New York-Newark-Jersey City, NY-NJ-PA (48%); Boston-Cambridge-Newton, MA-NH (49%); and Houston-The Woodlands-Sugar Land, TX (49%).

The extent of income inequality in a metropolitan area also matters. Middle-income adults account for a larger share of the adult population in metropolitan areas where there is less of a difference between the incomes of the highest-earning and lowest-earning households. Wausau, WI, Janesville-Beloit, WI, and Sheboygan, WI, the three areas with the largest middle classes, are also among the metropolitan areas that had the lowest levels of income inequality in 2014.