The Merrillville Branch of the Lake County Public Library have placed online several telephone directories for East Chicago that previously were only available on Microfilm. The communities represented are East Chicago and Indiana Harbor. These directories were published by the Reuben H. Donnelley Corporation of Chicago twice annually, and those digitized cover the years of 1926-1931. These are free to search, read, and/or download.
- East Chicago Directory – March 1926
- East Chicago Directory – September 1926
- East Chicago Directory – March 1927
- East Chicago Directory – September 1927
- East Chicago Directory – March 1928
- East Chicago Directory – September 1928
- East Chicago Directory – February 1929
- East Chicago Directory – June 1929
- East Chicago Directory – August 1931