Petersburg Local News: Topix
- Local, regional, and statewide news collected from diverse sources on the web.
- http://www.topix.com/city/petersburg-mi

Gradolph Field 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/88G

Petersburg, Michigan
- History of the community.
- http://www.infomi.com/city/petersburg/

Ingenium Engineering Services
- Science consultant and expert witness. Provides consulting for accident investigation and reconstruction, and litigation support for mechanical and forensic engineering.
- http://www.ingeniumservices.com/

The Auto Express
- Sells repairable automobiles with clean or salvaged titles. All vehicles sold meet state inspection guidelines. Small selection of automobile parts.
- http://www.theautoexpres.com/

Totem Pole Park
- An affordable family campground. Camping, fishing, and recreational activities.
- http://www.michcampgrounds.com/totempole/