History thumb|right|Main Street in Prince Frederick Prince Frederick has served as the county seat of Calvert County since 1722, when officials chose a plot of land known as "Williams' Old Field" as the spot for the new county courthouse. (Contemporary references to the piece of land include an upscale dining restaurant named Old Field Inn, and a street in Prince Frederick named "Old Field Lane.") The original courthouse was finally completed in 1732. The town was most likely named for George II's son Frederick, who was Prince of Wales during the time of the town's original conception.
History thumb|right|Main Street in Prince Frederick Prince Frederick has served as the county seat of Calvert County since 1722 when officials chose a plot of land known as "Williams' Old Field" as the spot for the new county courthouse (Contemporary references to the piece of land include an upscale dining restaurant named Old Field Inn and a street in Prince Frederick named "Old Field Lane") The original courthouse was finally completed in 1732 The town was most likely named for George II's son Frederick who was Prince of Wales during the time of the town's original conception