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- Geological Survey (U.S.)108
- Iowa. Department of Natural Resources. Geological Survey Bureau10
- G.W. & C.B. Colton & Co., cartographer6
- Colton, G. Woolworth (George Woolworth), 1827-1901, cartographer5
- Hansen, Robert E.4
- Rand McNally and Company4
- Henn, Williams & Co., cartographer3
- J.H. Colton & Co., cartographer3
- United States. Bureau of Public Roads3
- United States. Bureau of the Census3
- Anderson, Raymond R.2
- Chapman, Silas, cartographer2
- Mendenhall, Edward, cartographer2
- Mills & Co., cartographer2
- Mulford, John C., cartographer2
- Rand McNally and Company, cartographer2
- United States. General Land Office2
- Blanchard, Rufus, 1821-1904, cartographer1
- C.S. Hammond & Company1
- Cagle, Joseph W.1
