| St. Peter, Illinois | |
| Settlement Type: | Village |
| Image Map1: | Illinois in United States (US48).svg |
| Map Caption1: | Location of Illinois in the United States |
| Coordinates: | 38.8675°N -88.8503°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Fayette |
| Subdivision Type3: | Township |
| Subdivision Name3: | Lone Grove |
| Established Title: | Founded |
| Leader Title: | Mayor |
| Leader Title1: | Village president |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.35 |
| Area Total Sq Mi: | 0.52 |
| Area Land Km2: | 1.35 |
| Area Land Sq Mi: | 0.52 |
| Area Water Km2: | 0.00 |
| Area Water Sq Mi: | 0.00 |
| Elevation Ft: | 591 |
| Population As Of: | 2020 |
| Population Total: | 322 |
| Population Density Km2: | 238.81 |
| Population Density Sq Mi: | 618.04 |
| Timezone1: | CST |
| Utc Offset1: | -6 |
| Timezone1 Dst: | CDT |
| Utc Offset1 Dst: | -5 |
| Postal Code Type: | ZIP Code(s) |
| Postal Code: | 62880 |
| Area Code: | 618 |
| Blank Name: | FIPS code |
| Blank Info: | 17-67132 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2399171 |
| Blank2 Name Sec2: | Wikimedia Commons |
| Blank2 Info Sec2: | St. Peter, Illinois |
St. Peter or Saint Peter is a village in Fayette County, Illinois, United States. The population was 322 at the 2020 census.[2]
St. Peter is located in southeastern Fayette County. Illinois Route 185 passes through the village, leading northwest to Vandalia, the county seat, and southeast to Farina.
According to the 2021 census gazetteer files, St. Peter has a total area of 0.52sqmi, all land.[3]
As of the 2020 census there were 322 people, 152 households, and 103 families residing in the village. The population density was 618.04PD/sqmi. There were 144 housing units at an average density of 276.39/sqmi. The racial makeup of the village was 98.45% White, 0.00% African American, 0.00% Native American, 0.00% Asian, 0.00% Pacific Islander, 0.00% from other races, and 1.55% from two or more races. Hispanic or Latino of any race were 0.31% of the population.
There were 152 households, out of which 36.2% had children under the age of 18 living with them, 57.24% were married couples living together, 10.53% had a female householder with no husband present, and 32.24% were non-families. 25.66% of all households were made up of individuals, and 17.76% had someone living alone who was 65 years of age or older. The average household size was 3.45 and the average family size was 2.88.
The village's age distribution consisted of 33.1% under the age of 18, 5.7% from 18 to 24, 28.5% from 25 to 44, 15.1% from 45 to 64, and 17.6% who were 65 years of age or older. The median age was 32.2 years. For every 100 females, there were 94.7 males. For every 100 females age 18 and over, there were 98.0 males.
The median income for a household in the village was $50,938, and the median income for a family was $58,438. Males had a median income of $39,063 versus $26,875 for females. The per capita income for the village was $21,471. About 15.5% of families and 13.3% of the population were below the poverty line, including 21.1% of those under age 18 and 9.1% of those age 65 or over.