In 1927, the Spring Hill Banking Company was sold and has been known ever since as the State Bank of Spring Hill. Spring Hill residents organized a 4-H fair in 1938 and 1939. But after two successful fairs, it was decided to combine Spring Hill's 4-H fair with neighboring Gardner's Community Fair. The first official Johnson County Fair was the result. It was in Gardner during 1939 and continues to be conducted annually in early August.
Little history is available during the depression and war years.
By the end of the 1940s, few businesses remained on Main Street. However, early in the 1950s the town had an improvement program. Bonds were sold to construct a water treatment plant, a city lake northwest of town and water lines. By the end of the 1950s, horse drawn wagons were completely replaced by tractors for farm work. The grade school, started in 1937, had a regulation-size gym added in the early 1950s.