- Geological Survey (U.S.)44
- Commonwealth of Virginia. Department of Highways32
- Hildebrand, J. R.9
- Hotchkiss, Jedediah, 1828-18999
- Murrill, A.9
- Nirenstein's National Realty Map Company7
- Bureau of the Census5
- Preston, John, 1764-18275
- Roanoke Historical Society5
- Virginia. State Highway Commission5
- Wall, W. F.5
- Boyd, Charles Rufus, 1841-19034
- O.W. Gray & Son4
- Smithey & Boynton, Architects and Engineers (1935-1992) (Roanoke, Va.)4
- Virginia Polytechnic Institute and State University (1970-)4