I recently discovered a free app that tells you who owns the land in St. Louis County. So if you spend a lot of time outdoors, or are just curious, it's a great app to have on your phone. You can zero in on your current location and it will tell you the information. Or you can scroll through the map and zoom in and out in different areas. Most property lines are displayed and when you tap on the address label bar it will tell you who owns the property and how big it is.
Screen shot from work: Owner Midwest Communications, 13.48 acres.
If would like to down this app to your phone, or tablet which would give you a much larger screen to work with, here is the link from the county website . Have fun!