The Oldest Active Geocache

Historical marker location:

2485 Co Rd K, Colby, Kansas

( Marker is on County Road K, 0.3 miles west of Interstate 70.)

Marker installed: 2020

The geographic center of the contiguous United States is located in a field near Belle Fourche, South Dakota, but a marker for it is located in a small town called Belle Plaine, Kansas.