The Duncan Chapter, NSDAR was organized in Duncan, Oklahoma, on April 16, 1927 with 12 members. Organizing Chapter Regent was Mrs. Sam H. Williamson. There have been 41 subsequent Regents. Mrs. James Patterson and Mrs. Ernest E. Brown each served 3 terms. Mrs. George Jenkins, Mrs. Forrest C. Pittman, Mrs. Charles E. Clason and Mrs. Jack Greenwood served 2 terms.

Charter Members were: Mrs. Sam H. Williamson, Mrs. John A. Blaydes, Mrs. Ernest E. Brown, Mrs. Alfred L. Chase, Mrs. Isaac K. Grooms, Miss Julie Kinne, Mrs. S. Irby Kolb, Mrs. Henry W. Lemmons, Mrs. John W. Martin, Mrs. James L. Patterson, Mrs. J. B. Riddle, and Mrs. George R. Smith.

Mrs. Jenkins was instrumental in starting the Stephens County Historical Museum and set up the Charlotte Jenkins room furnished with fine antique furniture. She desired that the Duncan Chapter have some of their meetings in this beautiful room.

On February 22, 1974 the Duncan Chapter NSDAR placed a stone monument with a bronze plaque as a Bicentennial Project in Duncan Memorial Park. The plaque reads:

"Initial Point was established by the U.S. Government in 1870. All Oklahoma except the Panhandle was then divided into Townships north and south and ranges east and west of Initial Point. The "Indian Base Line" is two tenths of a mile south of this point on Beech road. Duncan is 41 miles west of Initial Point. The stones in this monument were taken from "Initial Point." Placed by Duncan Chapter National Society Daughters of the American revolution as a Bicentennial Project, February 22, 1974."

Mrs. Stuart Dunlap was Regent and Chairman of the Bicentennial Project.

"Initial Point" is the most important U.S. Geodetic survey mark for all of Oklahoma except the Panhandle. It is used as far north as South Dakota and by southwestern states.