Ontonagon County Plat
- A detailed, interactive plat map of the county in PDF format.
- http://www.dnr.state.mi.us/spatialdatalibrary/pdf_maps/glo_plats/Ontonagon/Ontonagon.htm

Ontonagon County Airport
- Aeronautical information includes location, runway, taxiways, navaids, radio frequencies, FBO information, weather, sunrise and sunset times, aerial photo, airport diagram.
- http://www.airnav.com/airport/KOGM

7-Day Forecast for Ontonagon County, Michigan
- Detailed 7-day forecast from the NOAA includes, current conditions, radar and satellite images, air quality reports and detailed information.
- http://www.crh.noaa.gov/ifps/MapClick.php?MapType=3&site=MQT&CiTemplate=1&map.x=86&map.y=138

Cemeteries of Ontonagon County
- Cemetery transcription library, contains cemetery records with lists of grave sites by name, date of birth and death.
- http://www.interment.net/us/mi/ontonagon.htm

Ontonagon County MSU Extension
- Offers agriculture programs, including master gardener classes and certification, 4H youth development program, family nutrition information, and community development assistance.
- http://www.msue.msu.edu/portal/default.cfm?pageset_id=28420

Ontonagon County
- County Clerk Office.
- http://www.michigan.gov/hal/0,1607,7-160-17449_18635_20736-56641--,00.html

Ontonagon County Chamber of Commerce
- Community information and links to local businesses.
- http://www.ontonagonmi.com