Greensboro is a town located on the banks of the Choptank River in Caroline County, Maryland. The population was 1,632 at the 2000 census. The ZIP code is 21639. The primary phone exchange is 482 and the area code is 410. The town is served by Maryland Routes 480 and 313. Greensboro hosts the Caroline County Softball League and the Caroline County Moose Lodge. Willow Grove was listed on the National Register of Historic Places in 1972.