Alleyton is an unincorporated community in central Colorado County, in the U.S. state of Texas, on the Colorado River.It is located 3 miles (5 km) east of Columbus south of Interstate 10 on Farm to Market Road 102. In 2000 Alleyton had 165 residents.lleyton is an unincorporated community in central Colorado County, in the U.S. state of Texas, on the Colorado River.