As of the census of 2010, there were 639 people, 228 households, and 161 families residing in the city. The population density was. There were 255 housing units at an average density of. The racial makeup of the city was 90.9% White, 0.3% African American, 1.4% Native American, 0.9% Asian, 1.4% from other races, and 5.0% from two or more races. Hispanic or Latino of any race were 5.8% of the population. There were 228 households of which 46.5% had children under the age of 18 living with them, 55.3% were married couplesliving together, 10.5% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 29.4% were non-families. 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. The average household size was 2.80 and the average family size was 3.39. The median age in the city was 30.2 years. 33.2% of residents were under the age of 18; 6.9% were between the ages of 18 and 24; 34.1% were from 25 to 44; 18% were from 45 to 64; and 7.7% were 65 years of age or older. The gender makeup of the city was 49.0% male and 51.0% female.
2000 census
As of the census of 2000, there were 434 people, 173 households, and 106 families residing in the city. The population density was 987.3 people per square mile. There were 198 housing units at an average density of 450.4 per square mile. The racial makeup of the city was 97.47% White, 0.69% African American, 1.38% from other races, and 0.46% from two or more races. Hispanic or Latino of any race were 3.92% of the population. There were 173 households out of which 34.7% had children under the age of 18 living with them, 52.0% were married couples living together, 5.2% had a female householder with no husband present, and 38.2% were non-families. 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 average household size was 2.51 and the average family size was 3.20. In the city, the population was spread out with 29.5% under the age of 18, 9.0% from 18 to 24, 33.2% from 25 to 44, 20.7% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 88.7 males. For every 100 females age 18 and over, there were 100.0 males. The median income for a household in the city was $29,306, and the median income for a family was $34,250. Males had a median income of $22,159 versus $21,125 for females. The per capita income for the city was $15,544. About 14.4% of families and 23.6% of the population were below the poverty line, including 31.3% of those under age 18 and 20.0% of those age 65 or over.
Government
The St. George government consists of a mayor and five council members. The council meets the 1st Thursday of each month at 7PM.
School unification consolidated St. George and Westmoreland schools forming USD 323 Rock Creek. Rock Creek High School is located approximately halfway between the towns. The Rock Creek High School mascot is Rock Creek Mustangs. St. George Elementary is located in St. George. St. George High School was closed through school unification in 1991. The St. George High School mascot was St. George Trojans.
