West Alton is a city in St. Charles County, Missouri, United States.

It is located at the tip of the peninsula formed by the confluence of the Missouri and Mississippi Rivers and is directly across Alton, Illinois.

[5] The community was named from its location on the western bank of the Mississippi River opposite Alton, Illinois.

23.6% of all households were made up of individuals, and 6.4% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 99.13% White, 0.17% Native American, 0.17% Asian, 0.52% from other races.

25.1% of all households were made up of individuals, and 7.1% had someone living alone who was 65 years of age or older.