Mercer Square is one of the Missouri parks in thicket's catalog. thicket is a field guide to the parks near you: it maps the ones you have never noticed, gives you a reason to actually go, and keeps a record of where you have been.
Where it is
Mercer Square is in Mercer County, Missouri. Its approximate coordinates are 40.51089, -93.53221.
Check in at Mercer Square
thicket verifies you are actually here by GPS when you check in, so a visit means you went. Checking in builds a streak, earns achievements, and fills in your map of the places you have been.