To promote the building of a town the Cooperstown Townsite Company was formed in 1882. This company immediately platted the town, which was named Cooperstown, and filed its plat on October 26th of that year, only 12 days before the November 7th election which was to decide the location of the county seat. Cooperstown won the election and became the county seat.
According to the original plat, Cooperstown was laid out with its streets running north and south and numbered beginning from the west side. The avenues were east and west and were given names. These included the names of members who composed the Townsite Company. Rollin Avenue was named for R. C. Cooper
Lenham Avenue for N. L. Lenham of the Lenham Elevator and Lumber Company. This company consisted of George Lenham, president, N. L. Lenham, general manager, who were brothers, and Louis Lenham, their father who was treasurer. Burrell Avenue was named for J. M. Burrell who was a member of the Townsite Company and who, with George L. Lenham, organized the first bank at Cooperstown. Roberts Avenue for Mr. C. A. Roberts who was also one of the owners of the Townsite Company. Mr. Roberts was also along on the organization of the Sanborn, Cooperstown and Turtle Mountain Railroad. He was also identified with the Fargo Southern Railway, The Fargo Street Railway, Fargo Iron Works, Cooperstown Elevator Company, Yellowstone National Park Improvement Company, and was a member of the firm of Stanford and Company, flour and feed merchants at Fargo. Foster Avenue for Foster who surveyed the town lots
Hobart and Louis Avenues whose authorship is not known, Odegard Avenue for Mr. Odegard, a merchant and Howard Avenue for Howard Oviatt, a big landowner in Griggs County
In the liquidation of the partnership of the Cooper brothers in 1886, R. C. Cooper purchased T. J. 's interest in the Townsite Company for $9000.00.
The Townsite Company had planned to have the Court House on the hill where the Water Tower stands. But there was some disagreement among the county commissioners when the Courthouse was to be built. The Cooper Brothers then platted the "Cooper Addition" south of the first plat, and then offered the County Commissioners any block of it they chose free plus one thousand dollars in cash when building completed.
Source: Griggs County History 1879 - 1976 Page 36