Chain of Rocks is a village in Lincoln County, Missouri, United States. The population was 93 at the 2010 census.
Chain of Rocks was platted in the 1830s, and named for a rock formation near the original town site. A post office called Chain of Rocks was established in 1869, and remained in operation until 1907.
Chain of Rocks is located at 38°54′53″N 90°48′8″W (38.914718, -90.802133). It is named after an exposure of bedrock in the Cuivre River north of St. Louis that forms a remarkable "chain of rocks" across its width. According to the United States Census Bureau, the village has a total area of 0.17 square miles (0.44 km2), all of it land.
As of the census of 2010, there were 93 people, 32 households, and 26 families residing in the village. The population density was 547.1 inhabitants per square mile (211.2/km2). There were 39 housing units at an average density of 229.4 per square mile (88.6/km2). The racial makeup of the village was 100.0% White.
There were 32 households of which 43.8% had children under the age of 18 living with them, 62.5% were married couples living together, 15.6% had a female householder with no husband present, 3.1% had a male householder with no wife present, and 18.8% were non-families. 15.6% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.91 and the average family size was 3.27.
The median age in the village was 39.3 years. 30.1% of residents were under the age of 18; 8.6% were between the ages of 18 and 24; 20.4% were from 25 to 44; 29.1% were from 45 to 64; and 11.8% were 65 years of age or older. The gender makeup of the village was 49.5% male and 50.5% female.
As of the census of 2000, there were 91 people, 34 households, and 24 families residing in the village. The population density was 528.1 people per square mile (206.7/km²). There were 42 housing units at an average density of 243.7/sq mi (95.4/km²). The racial makeup of the village was 100.00% White.
There were 34 households out of which 38.2% had children under the age of 18 living with them, 58.8% were married couples living together, 8.8% had a female householder with no husband present, and 29.4% were non-families. 29.4% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.68 and the average family size was 3.29.
In the village, the population was spread out with 28.6% under the age of 18, 6.6% from 18 to 24, 33.0% from 25 to 44, 22.0% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 102.2 males. For every 100 females age 18 and over, there were 103.1 males.
The median income for a household in the village was $31,250, and the median income for a family was $38,125. Males had a median income of $61,000 versus $22,500 for females. The per capita income for the village was $18,848. There were 7.1% of families and 13.6% of the population living below the poverty line, including 28.6% of under eighteens and 44.4% of those over 64.