The population stood at 536 in 1900. Four Mile Dam, a more permanent and extensive dam, was completed in 1904. Junction continued to grow rapidly, with around 800 residents living in the community in 1910. That figure had grown to 1,250 by 1920. By the late 1920s, citizens felt the need for the benefits of a municipal government. On August 27, 1927, H.O. Denman and 152 others presented an incorporation petition to Kimble County Judge J.B. Randolph. In the election, 390 votes were cast: 274 (70%) "For Incorporation" and 116 (30%) "Against Incorporation". A city officers' election took place on October 13, 1927, with Ernest Holekamp elected as Junction's first mayor.