Twelfth Census of the United States — 1900. p. 450.

Thirteenth Census of the United States — 1910. 1,453.

Logan is the county seat of Harrison County, which was established on January 15, 1851. Harrison County was named for William Henry Harrison (1773-1841), the ninth President of the United States. In 1853, a site named Magnolia was chosen as the county seat. in 1876, the site was moved to the town of Logan, which was named for General John A. Logan (1826-1886), who had worked to establish Memorial Day. Harrison County received the highest number of Carnegie grants with Logan, Missouri Valley, Dunlap, and Woodbine as recipients.

(Source: Pratt, LeRoy G. “The Counties and Courthouses of Iowa.” Mason City, Ia; Klipto Printing & Office Supply Company, 1977, p. 150.)