Inside of the city of Upper Marlboro, there are three bodies of water: Federal Spring Branch, Western Branch Patuxent River, and School House Pond. Federal Spring Branch flows into the Western Branch Patuxent River nearby Main Street, Upper Marlboro. School House Pond is to the south of the other two bodies. The branch is about approximately two miles long, and starts approximately one mile to the west of Upper Marlboro. It splits into four unnamed steams, that join together later on. The only bridge over the branch is Old Marlboro Pike, or Maryland Route 725. School House Pond is a small pond north of Main Street, yet south of Federal Spring Branch. The pond is 12 acres in size, with a 0.75 mile boardwalk around the edge. There is also a walking trail through the small forested area north of the pond. The largest attraction at the pond is fishing. The pond is restocked with 800 trout a year. The Western Branch Patuxent River is one of the largest tributaries of the Patuxent River. Its flow starts in Woodmore, Maryland, and enters the Patuxent River just a few miles south of Upper Marlboro. The river's largest tributary south of Upper Marlboro is Collington Branch, which flows into the Western Branch Patuxent River just before entering the Patuxent.   about 6,000 people work in the town, with employees of the Prince George's County government making up the majority. As of the census of 2010, there were 631 people, 290 households, and 157 families residing in the town. The population density was . There were 310 housing units at an average density of . The racial makeup of the town was 33.8% White, 57.8% African American, 0.2% Native American, 1.1% Asian, 2.9% from other races, and 4.3% from two or more races. Hispanic or Latino of any race were 4.1% of the population. There were 290 households of which 29.0% had children under the age of 18 living with them, 34.1% were married couples living together, 17.6% had a female householder with no husband present, 2.4% had a male householder with no wife present, and 45.9% were non-families. 36.9% of all households were made up of individuals and 11% had someone living alone who was 65 years of age or older.