In the mid-20th century, the “working class” — workers engaged in manufacturing, construction, transportation and maintenance — comprised half the nation’s workforce. Today, the number is down to one fifth. Of the country’s Metropolitan Statistical Areas, Elkhard-Goshen, Indiana, has the highest percentage working-class population, 46.0%. The highest in Virginia is Harrisonburg, ranked 17th in the country, with 32.5%.

Source:

Richard Florida, Atlantic Cities blog.