The steel industry's jobs provided Gary with rapid growth and a diverse population within the first 26 years of its founding. According to the 1920 United States Census, 29.7% of Gary's population at the time was classified as foreign-born, mostly from eastern European countries, with another 30.8% classified as native-born with at least one foreign-born parent. By the 1930 United States Census, the first census in which Gary's population exceeded 100,000, the city was the fifth largest in Indiana and comparable in size to South Bend, Fort Wayne, and Evansville. At that time, 78.7% of the population was classified as white, with 19.3% as foreign-born and another 25.9% as native-born with at least one foreign-born parent. In addition to white internal migrants, Gary had attracted numerous African-American migrants from the South in the Great Migration, and 17.8% of the population was classified as black. 3.5% were classified as Mexican (now likely to be identified as Hispanic, as some were likely American citizens in addition to immigrants).
The steel industry's jobs provided Gary with rapid growth and a diverse population within the first 26 years of its founding. According to the 1920 United States Census, 29.7% of Gary's population at the time was classified as foreign-born, mostly from eastern European countries, with another 30.8% classified as native-born with at least one foreign-born parent. By the 1930 United States Census, the first census in which Gary's population exceeded 100,000, the city was the fifth largest in Indiana and comparable in size to South Bend, Fort Wayne, and Evansville. At that time, 78.7% of the population was classified as white, with 19.3% as foreign-born and another 25.9% as native-born with at least one foreign-born parent. In addition to white internal migrants, Gary had attracted numerous African-American migrants from the South in the Great Migration, and 17.8% of the population was classified as black. 35% were classified as Mexican (now likely to be identified as Hispanic, as some were likely American citizens in addition to immigrants).