- Green, B. D. (Surveyor)1
- Greenleaf, J. (Jeremiah)1
- Gregory, James F. (James Fingal), 1843-18971
- Gulf Oil Corporation1
- Hammond Incorporated1
- Hammond, John T., approximately 1820-1
- Harley, David S.1
- Hart, Henry (Civil engineer)1
- Haske, Donald C.1
- Hearding, W. H. (William Hellins)1
- Heliotype Printing Co.1
- Highway Planning Survey (Mich.)1
- Hillman Chamber of Commerce1
- Historic Memorials Society (Detroit, Mich.)1
- Historic Urban Plans (Firm)1
- Historic Urban Plans (Firm) http://id.loc.gov/authorities/names/n81127555 http://viaf.org/viaf/1324451251
- Holcroft, John1
- Homer Warren and Company.1
- Hotchkiss & Mercer1
- Hotchkiss, George Woodward, 1831-1