Geography
Saint Peters is located at 38°46'44" North, 90°36'11" West (38.778893, -90.603131)1.
According to the United States Census Bureau, the city has a total area of 54.9 km² (21.2 mi²). 54.9 km² (21.2 mi²) of it is land and 0.0 km² (0.0 mi²) of it is water. The total area is 0.00% water.
Demographics
As of the census of 2000, there are 51,381 people, 18,435 households, and 13,936 families residing in the city. The population density is 936.7/km² (2,425.5/mi²). There are 18,776 housing units at an average density of 342.3 persons/km² (886.3 persons/mi²). The racial makeup of the city is 94.25% White, 2.80% African American, 0.20% Native American, 1.23% Asian, 0.01% Pacific Islander, 0.44% from other races, and 1.07% from two or more races. 1.49% of the population are Hispanic or Latino of any race.
There are 18,435 households out of which 42.3% have children under the age of 18 living with them, 62.8% are married couples living together, 9.7% have a woman whose husband does not live with her, and 24.4% are non-families. 20.3% of all households are made up of individuals and 6.4% have someone living alone who is 65 years of age or older. The average household size is 2.78 and the average family size is 3.24.
In the city the population is spread out with 30.0% under the age of 18, 7.4% from 18 to 24, 33.5% from 25 to 44, 21.3% from 45 to 64, and 7.8% who are 65 years of age or older. The median age is 34 years. For every 100 females there are 95.0 males. For every 100 females age 18 and over, there are 90.6 males.
The median income for a household in the city is $57,898, and the median income for a family is $65,123. Males have a median income of $45,497 versus $30,295 for females. The per capita income for the city is $22,792. 2.7% of the population and 1.5% of families are below the poverty line. Out of the total people living in poverty, 2.6% are under the age of 18 and 5.1% are 65 or older.