| Official Name: | Rock Precinct |
| Image Map1: | Map of Illinois highlighting Hardin County.svg |
| Mapsize1: | 150 |
| Map Caption1: | Hardin County's Location in Illinois |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Hardin |
| Area Total Sq Mi: | 59.24 |
| Area Land Sq Mi: | 56.70 |
| Area Water Sq Mi: | 2.54 |
| Area Water Percent: | 4.29 |
| Population As Of: | 2020 |
| Population Total: | 411 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Elevation Ft: | 499 |
| Coordinates: | 37.5342°N -88.1669°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1928635 |
| Blank1 Name Sec1: | FIPS code |
| Blank1 Info Sec1: | 17-069-92995 |
Rock Precinct is located in Hardin County, Illinois, USA. As of the 2020 census, there were 155 households and a population of 411.[1]
According to the 2021 census gazetteer files, Rock Precinct has a total area of 59.24sqmi, of which 56.7sqmi (or 95.71%) is land and 2.54sqmi (or 4.29%) is water.[2]
As of the 2020 census[3] there were 411 people, 155 households, and 130 families residing in the precinct. The population density was 6.94PD/sqmi. There were 317 housing units at an average density of 5.35/sqmi. The racial makeup of the precinct was 92.46% White, 0.00% African American, 0.00% Native American, 0.97% Asian, 0.00% Pacific Islander, 0.73% from other races, and 5.84% from two or more races. Hispanic or Latino of any race were 2.92% of the population.
There were 155 households, out of which 34.20% had children under the age of 18 living with them, 76.13% were married couples living together, 3.87% had a female householder with no spouse present, and 16.13% were non-families. 7.10% of all households were made up of individuals, and 4.50% had someone living alone who was 65 years of age or older. The average household size was 3.17 and the average family size was 3.14.
The precinct's age distribution consisted of 12.1% under the age of 18, 15.5% from 18 to 24, 24.2% from 25 to 44, 29.6% from 45 to 64, and 18.5% who were 65 years of age or older. The median age was 41.0 years. For every 100 females, there were 106.2 males. For every 100 females age 18 and over, there were 110.1 males.
The median income for a household in the precinct was $69,911, and the median income for a family was $69,750. Males had a median income of $47,414 versus $24,110 for females. The per capita income for the precinct was $35,244. About 0.0% of families and 4.7% of the population were below the poverty line, including 0.0% of those under age 18 and 21.9% of those age 65 or over.