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- United States Surveyor General1,671
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- Iowa Publishing Co.143
- United States. Department of Agriculture134
- Anderson Publishing Co.127
- United States. Commodity Stabilization Service116
- Iowa. State Planning Board108
- United States. Department of Agriculture. Production and Marketing Administration97
- University of Iowa96
- W.W. Hixson & Co.93
- Geo. A. Ogle & Co.91
- North West Publishing Co.86
- United States. Soil Conservation Service43
- Huebinger Survey and Map Publishing Co.40
- Warner & Foote34
- Thompson and Everts21
- Midland Map Co.14
- Harrison & Warner9
- Rand McNally & Company9
- Kenyon Company (Des Moines, Iowa)8