Kevin Johnson sent along this amazing find, from Google Books.  The Negro in Chicago: A Study in Race Relations and a Race Riot (1922) was a sociological study overseen by Charles Spurgeon Johnson.  It was researched under the auspices of the Chicago Commission on Race Relations in the wake of the July 1919 riots in Chicago.  In addition to the statistics, Johnson includes profiles of a number of pseudonymous African Americans in Chicago.  See if you can guess who “Mr. G—” is…

By the way: Foster reports here that he was born in La Grange, Texas, rather than Calvert, where he grew up.  La Grange is in Fayette County, not too far from Calvert.  I would tend to view this source as pretty credible.