Red Oak is a city in Ellis County, Texas, situated directly on Interstate 35E about 18 miles south of downtown Dallas, within the Dallas–Fort Worth metroplex. With a population of roughly 14,000 at the 2020 census, it anchors the northern tier of Ellis County alongside nearby Glenn Heights, Ovilla, and Lancaster. The city's story is one of steady suburban evolution. Red Oak grew up as a farming community, and the arrival of the Missouri-Kansas-Texas Railroad in 1884 connected the area to Dallas and Waco, planting the seed for what would become a commuter town. Through the late twentieth century, most residents worked in Dallas or Fort Worth, and the city has retained that bedroom-community identity even as it has grown and added its own commercial base. Transportation defines Red Oak's appeal. The city sits directly on I-35E, the principal highway between Dallas and Waco, with U.S. Highway 77 running nearby, and it lies within about 45 minutes of five interstate highways. That position gives residents one of the shortest Dallas commutes of any Ellis County city, while Fort Worth is roughly 30 minutes to the northwest. Local life is anchored by Red Oak Independent School District, an eight-campus system serving about 6,700 students, and by a parks-and-recreation network that includes Watkins Park. The city's newer subdivisions and community amenities reflect its role as a growing suburban address, while its small-town roots persist in local events and civic life. Red Oak suits commuters to Dallas or Fort Worth seeking newer, more spacious homes at a remove from the urban core, families drawn to the school district, and buyers who want Ellis County living with direct interstate access.