The town of Keymar is in Frederick County Maryland and bordering Carroll County. We host outdoor / garden weddings. This is an example of an eighteenth-century mill village that evolved into a small town with the coming of the Western Maryland Railroad. It is believed that Abraham Lincoln visited here. He was a close friend of the owners and Lincoln referred to him in his writings. Prosperity Mansion and Farm is set in the beautiful countryside of Frederick Maryland and on the border of Carroll County. Our venue offers a wonderful blend of historic detailing and modern amenities. Enjoy a private setting with a small-town feel. Experience the tranquility of acres of open fields, mature trees and rolling hills. Offering gracious gardens, patios, and fountains for outdoor entertaining. The picturesque setting is the perfect backdrop for your weddings.