I don't know addresses, but for research, I've used the Grayson County Courthouse (in the square); the Sherman Library (a few blocks off the square) especially for obits, past copies of the Sherman Democrat, and other local books; and a Historical Society/Museum (about 2 blocks off the square) for local history and books that I could buy. The county tax office is 1 block off the square. Good Luck and happy hunting Denise Farrell