Seymour is a city in and the county seat of Baylor County, Texas, set in the Rolling Plains of North Texas along the Brazos River. Its population was 2,575 in the 2020 census, and it functions as the commercial, governmental, and social center of a sparsely settled ranching county. The town's economy has long been built on agriculture. Cotton, grains, and livestock shaped its early growth, and cattle ranching remains the backbone of the surrounding county, where livestock production dominates agricultural sales and native-grass pasture, mesquite country, and river-bottom cover define the landscape. Oil production added another economic layer in the twentieth century, and the town reached its population peak of nearly 3,800 in 1950 before settling into its present size. Seymour holds a notable place in the region's natural and cultural history. The Permian Red Beds around Baylor County have yielded important fossil discoveries, including Seymouria baylorensis, an extinct amphibian named for the town and county. Culturally, the Old Settlers Reunion and Rodeo, held each July, traces its origins to an 1896 Cowboy Reunion and remains one of the oldest continuously held celebrations of its kind in the region, keeping Seymour's ranching heritage at the center of community life. Lake Kemp, a 15,590-acre reservoir on the Wichita River about eight miles north, is the area's major recreational asset, drawing anglers, boaters, and campers. The Brazos River also runs near town, adding to the outdoor landscape. Seymour appeals to ranching and agricultural families, retirees seeking a quiet county-seat lifestyle, and anyone drawn to the open country, hunting, and lake recreation of North Texas — a community where the courthouse, the school, and the rodeo still define daily life.