Find all 17 "S.T.C.Q." caches, assemble the code letters to decode the 17-letter message and submit the completed message to Geopractor to receive your commemorative coin. This is a family-friendly trail. Hartington is a city in Cedar County, Nebraska, population 1,554. It is the county seat of Cedar County platted in 1883 as a water stop for the railroad. Hartington has a large downtown shopping area including the very historic Hartington Hotel. The Nissen Winery offers tours a few miles to the north.