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. The statistical area encompasses the town center of Montville, as well as the adjacent villages of
. 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. Mailing addresses for this ZIP code use "Uncasville" as the place name. In addition to the Oxoboxo River CDP, the Uncasville ZIP code additionally includes the
According to the United States Census Bureau, the CDP has a total area of 11.6 km² (4.5 mi²). 11.0 km² (4.3 mi²) of it is land and 0.6 km² (0.2 mi²) of it (5.12%) is water.