St. Marys is located in Warren County, IA. The population is 126, making St. Marys the 8th largest city in Warren County.
There are 0 public schools in St. Marys with an average Homefacts rating of NA. The total crime rate for St. Marys is moderate , and there are 0 registered sex offenders residing in the city. Unemployment in St. Marys is low and the median home sales price is $0. Detailed and up-to-date St. Marys property reports are available for any property address.
Cities near St. Marys include Jackson Township, St. Charles and Bevington.