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West Alton, Missouri
Post office in West Alton, May 2012
Post office in West Alton, May 2012
Location of West Alton, Missouri
Location of West Alton, Missouri
Country United States
State Missouri
County St. Charles
 • Total 37.07 sq mi (96.02 km2)
 • Land 28.81 sq mi (74.62 km2)
 • Water 8.26 sq mi (21.40 km2)
443 ft (135 m)
 • Total 522
 • Estimate 
 • Density 18.29/sq mi (7.06/km2)
Time zone UTC-6 (Central (CST))
 • Summer (DST) UTC-5 (CDT)
FIPS code 29-78514
GNIS feature ID 0756890

West Alton is a city in St. Charles County, Missouri, United States. The population was 522 at the 2010 census. It is located at the tip of the peninsula formed by the confluence of the Missouri and Mississippi Rivers.


A post office called West Alton has been in operation since 1895. The community was named from its location on the western bank of the Mississippi River opposite Alton, Illinois.


West Alton is located at 38°52′4″N 90°13′33″W / 38.86778°N 90.22583°W / 38.86778; -90.22583 (38.867798, -90.225856), in St Charles County.

According to the United States Census Bureau, the city has a total area of 37.06 square miles (95.98 km2), of which, 28.81 square miles (74.62 km2) of it is land and 8.25 square miles (21.37 km2) is water. West Alton is located at the intersection of Federal Route 67 and County Highway 94.


Historical population
Census Pop.
2000 573
2010 522 −8.9%
Est. 2019 527 1.0%
U.S. Decennial Census

2010 census

As of the census of 2010, there were 522 people, 203 households, and 144 families living in the city. The population density was 18.1 inhabitants per square mile (7.0/km2). There were 267 housing units at an average density of 9.3 per square mile (3.6/km2). The racial makeup of the city was 98.7% White, 0.6% African American, 0.4% Native American, and 0.4% from two or more races. Hispanic or Latino of any race were 1.0% of the population.

There were 203 households, of which 32.5% had children under the age of 18 living with them, 49.8% were married couples living together, 13.3% had a female householder with no husband present, 7.9% had a male householder with no wife present, and 29.1% were non-families. 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 average household size was 2.57 and the average family size was 2.97.

The median age in the city was 41.3 years. 21.6% of residents were under the age of 18; 8.9% were between the ages of 18 and 24; 23.5% were from 25 to 44; 32.9% were from 45 to 64; and 13.2% were 65 years of age or older. The gender makeup of the city was 52.5% male and 47.5% female.

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