- Hinton, John Howard, 1791-18732
- Hitchcock, Edward, 1793-18642
- Hoempler, Carlos E. C2
- Houghton, Douglass, 1809-18452
- Hubbard, Bela, 1814-18962
- Huebinger Surveying and Map Publishing Co.2
- Humphreys, A. A. (Andrew Atkinson), 1810-18832
- Humphreys, A. A. (Andrew Atkinson), 1810-1883, director2
- I.T. Hinton & Simpkin & Marshall.2
- Ikeda, Tōri2
- Illinois. Railroad and Warehouse Commission2
- India. Surveyor General2
- Iowa Geological Survey.2
- Iowa State College. Department of Civil Engineering2
- Iowa. Highway Commission.2
- Iowa. State Planning Board. Business Research Committee2
- Iowa. State Planning Board. Committee on Business and Industry2
- Iowa. State Planning Board. Committee on Forests & Wasteland2
- Iowa. State Planning Board. Committee on Rural, Secondary, & Adult Education Survey2
- Iowa. State Planning Board. Transportation Committee2