Cave is a City in Lincoln County, Missouri, United States. The population was 5 at the 2010 census. However, As of the 2020 census, the population is 0, making it the smallest incorporated community in the U.S state of Missouri. It is the 939th largest city in Missouri and the 19481st largest city in the United States. Cave is currently declining at a rate of 0.00% annually and its population has decreased by 0.00% since the most recent census, which recorded a population of 5 in 2010.