History:
Simpson, which was previously known as Brittsville, also Brittain and Simpsonville, originated in 1871 when G. Beaver, who at that time owned a mill at Delphos, came up the Solomon River to sight a spot for a mill. With financial aid from Thomas Shanks and Alfred Simpson, a mill was erected at the site where Brittsville started.

By 1879 Brittsville was a thriving little village with a store, drug store, blacksmith shop, post office and stage stand. With the coming of railroads, between 1879 and 1880, Brittsville was moved a mile to the present townsite of Simpson. In 1882, after Alfred Simpson deeded a portion of land upon which the town was built to the city, the name was changed to Simpson, in his honor.

The land on which the city was situated was first owned by T. E. Thackery, who on December 29, 1875, registered a receivers receipt for the property.