Alton is a city in Hidalgo County, Texas, United States. The population was 18,198 at the 2020 census. Alton was founded in 1910 or 1911 by citi…Alton is a city in Hidalgo County, Texas, United States. The population was 18,198 at the 2020 census. Alton was founded in 1910 or 1911 by citizens and railroad officials of Alton, Illinois. On September 21, 1989, the Alton bus crash occurred; a Dr. Pepper truck hit a Mission Consolidated Independent School District school bus and caused it to fall into a caliche pit, killing 21 students.
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