Cave-In-Rock is a village in Hardin County, Illinois, United States. Its principal feature and tourist attraction is nearby Cave-In-Rock, on the banks of the Ohio River. In 1816, the earliest known permanent white settlers arrived and started building a town near the cave. The town was originally known as Rock and Cave, Illinois, with a post office under this name. On October 24, 1849, the town was officially renamed Cave-In-Rock. Cave-In-Rock was incorporated as a village in 1901. The population was 318 at the 2010 census. Beginning in the 1790s, Cave-in-Rock became a refuge stronghold for frontier outlaws, on the run from the law which included river pirates and highwaymen Samuel Mason and James Ford, tavern owner/highwayman Isaiah L. Potts, serial killers/bandits the Harpe brothers, counterfeiters Philip Alston, Peter Alston, John Duff, Eson Bixby, and the Sturdivant Gang, and the post-American Civil War bandit, Logan Belt. Geography Cave-In-Rock is located in southeastern Hardin County at (37.470050, -88.166297). It is bordered to the south by the Ohio River, which forms the state boundary with Kentucky. The Cave-In-Rock Ferry crosses the Ohio from Cave-In-Rock village to Crittenden County, Kentucky, at a point north of Marion. Cave-In-Rock is the southern terminus of Illinois Route 1, which leads north from the ferry to its northern terminus in Chicago. According to the 2010 census, Cave-In-Rock has a total area of , of which (or 87.68%) is land and (or 12.32%) is water. Demographics As of the census of 2000, there were 346 people, 165 households, and 96 families residing in the village. The population density was . There were 201 housing units at an average density of . The racial makeup of the village was 98.27% White, 1.16% other races, and 0.58% from two or more races. Hispanic or Latino of any race were 2.02% of the population. There were 165 households, out of which 28.5% had children under the age of 18 living with them, 44.8% were married couples living together, 10.3% had a female householder with no husband present, and 41.8% were non-families. 41.2% of all households were made up of individuals, and 28.5% had someone living alone who was 65 years of age or older. The average household size was 2.10 and the average family size was 2.82. In the village, the population was spread out, with 23.4% under 18, 7.5% from 18 to 24, 24.9% from 25 to 44, 19.4% from