[8] St. George is part of the Manhattan, Kansas Metropolitan Statistical Area.

As of the census[9] of 2010, there were 639 people, 228 households, and 161 families residing in the city.

There were 255 housing units at an average density of 375.0 per square mile (144.8/km2).

24.6% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older.

As of the census of 2000,[10] there were 434 people, 173 households, and 106 families residing in the city.

There were 198 housing units at an average density of 450.4 per square mile (173.9/km2).

28.3% of all households were made up of individuals, and 5.8% had someone living alone who was 65 years of age or older.

The St. George government consists of a mayor and five council members.