- Geil, John F., cartographer1
- Geil, Samuel, publisher1
- General Telephone Company of Michigan1
- Genesee County Parks & Recreation Commission (Genesee County, Mich.)1
- Geographical Publishing Co.1
- Geological Survey Division1
- George F. Cram Company1
- George Wahr (Firm)1
- George Wahr Publishing Company.1
- Gibson, Ben S.1
- Gladwin County Chamber of Commerce1
- Gogebic County Board of Supervisors1
- Gould, Harold D.1
- 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