What is the legal age to leave a child home alone in Missouri?

There are very few states in the U.S. with legal minimum ages, but many state agencies have published guidelines (Georgia, Illinois, Maryland and Oregon are a few of the states with very specific ages). Typically 8 year olds and over can be left at home for up to several hours (usually after school before a parent gets home from work).

12 years old appears to be the most common recommendation. http://www.latchkey-kids.com/latchkey-kids-age-limits.htm provides a state by state comparison.