Oxoboxo River is a census-designated place (CDP) in the town of Montville in New London County, Connecticut, United States. The population was 2,938 at the 2000 census and 3,165 at the 2010 census. The statistical area encompasses the town center of Montville, as well as the adjacent villages of Palmertown and Uncasville. The name of the statistical area is from the river of the same name running through the CDP.
The U.S. Postal Service includes the entire area of the CDP in ZIP code 06382, for which the USPS uses "Uncasville" as the place name. The Uncasville ZIP code also encompasses the Mohegan reservation, including the Mohegan Sun casino complex, and other parts of Montville.
The CDP takes its name from the Oxoboxo River, a tributary of the Thames River that flows through the CDP. According to the United States Census Bureau, the CDP has a total area of 11.6 km² (4.5 mi²), of which 11.0 km² (4.3 mi²) is land and 0.6 km² (0.2 mi²) (5.1%) is water.
As of the census of 2000, there were 2,938 people, 1,245 households, and 776 families residing in the CDP. The population density was 266.3/km² (689.6/mi²). There were 1,356 housing units at an average density of 122.9/km² (318.3/mi²). The racial makeup of the CDP was 90.50% White, 1.60% African American, 1.29% Native American, 2.55% Asian, 1.09% from other races, and 2.96% from two or more races. Hispanic or Latino of any race were 3.51% of the population.