1957 Map of Upper Marlboro

Evidence of the region's older infrastructure persists through labels like the Old Railroad Grade and the clustering of historic congregations such as St Marys Ch and St Barnabas Ch. Smaller communities such as Rosaryville, Croom Station, and Westphalia are connected by a network of rural roads, while industrial pockets like various Gravel Pits and the local Fairgrounds suggest the varied economic activities of the era. The terrain is defined by the drainage of the Western Branch and Piscataway Creek.