As an unincorporated area, Wheaton's boundaries are not officially defined. The United States Census Bureau has not chosen to make Wheaton itself into a Census-Designated Place, but combines it with Glenmont into a single Wheaton-Glenmont CDP, centered at 39°3' North, 77°3' West, whose 2000 census population was 57,694. The United States Geological Survey, however, does consider Wheaton as a place whose center is at latitude 39°2'23" North, longitude 77°3'20" West. The United States Postal Service does not consider Wheaton as a place on its own, but treats it as a part of the Silver Spring area; however, it does have a separate Zip Code: 20902. Other organizations may use their own definitions.