History of St. Clair County, Missouri, 1883, page 1047:
Dallas township lies in the southeast corner of the county, being bound on the north by Polk Township, east by Hickory County, south by Hickory County and Collins Township, and west by Doyal Township. It was established, and being congressional Township 37 of Range number 24, on June 5, 1872. Originally, and for a number of years, Dallas Township as now known, was a part of Polk; in fact Polk Township covered this territory up to the above date. Elijah Rice may be said to be among the earliest settlers in this township. He came in 1837 and settled on the southeast quarter of section seven. R. Eads and Francis Yoast built the first water mill in the township in 1844, and sold to John J.C. Wolfe.
A History of Henry and St. Clair Counties, 1883:
Dallas Township, page 1048 - Dallas Township, taken together, may be said to be a good stock raising and cereal growing township. There is quite a large portion broken land, somewhat hilly and rough, but still excellent stock ranges. Her red land is good what land and her bottom lands none better for corn. It is mostly timbered, very little prairie in proportion.
Sandstone, excellent for building purpose, is found, perhaps too much of it. The limestone soil is strong, and some flint is found. The township may be said to be rolling, as a general thing.
In 1880, Dallas Township had a population of 635, this being its first census recorded except in 1876, when its population was 548. This would show that it had received little or no immigration.
The King Prairie, so called, is the most noted in the township, covering some three sections. The Kings came in 1834 or ’35, and owned some 400 acres, and from them it took its name, and is as pretty a piece of land as can be found anywhere. Rolling enough to have good drainage, the soil deep, rich and fruitful, it is looked upon as the garden spot of Dallas Township.
One curious thing in connection with this township is that a few deer and wild turkeys are yet found within its limits, but this probably arises from its close proximity to Hickory County, which may be considered one of the finest counties in the state for the home of wild animals.