In the early 20th century many Rusyn immigrants from the Carpathian Mountains settled in Four Mile Run. Most came to work in Pittsburgh's steel industry, and the neighborhood was adjacent to a large steel mill of the Jones and Laughlin Steel Company.
During the early 20th century, numerous Rusyn immigrants from the mountainous regions of Eastern Europe settled in Four Mile Run. They primarily found employment in Pittsburgh's steel manufacturing industry, with their neighborhood being adjacent to a significant steel production facility run by the Jones and Laughlin Steel Company.