- Nestled in the rolling green hills of north central Missouri, Putnam County is home to friendly people who value education, strong families, and outdoor recreation. This quiet rural community's county seat is Unionville, with surrounding towns of Graysville, Hartford, Lemons, Livonia, Lucerne, Martinstown, Powersville and Worthington. An agricultural based community, major income sources are ...www.nemr.net/~putco