Grayson County is located near Sherman TX. north of Plano and Dallas, TX. Some of the cities in Grayson County include Sherman and Denison, Texas. Grayson County is surrounded by Denton, Cooke, Fannin, and Collin county while bordering three Oklahoma State Counties. Search homes for sale in Grayson County or schedule a showing on any of these Grayson County real estate listings.