King also helped found the Wyoming communities of Fetterman City, Douglas and Casper. In 1889 King expanded into banking and on June 10, 1889, added the word "bankers" to the name of his company. In 1896 he sold the bank. Previously known as the First National Bank of Casper, it is now part of the First Interstate BancSystem based in Wyoming and Montana. King then concentrated on a freight business between the rail line terminus in Casper and the mineral-rich Wind River region. He helped found the Wyoming communities of Shoshoni, Riverton, and Arapahoe.