St Marys Horticultural Society
- A group of people interested in gardening and the beautification of St. Marys. Includes a brief history, news and events.
- http://www.gardenontario.org/site.php/stmarys

The Friendship Centre
- A community centre for adults aged 50 and over offering a wide variety of special recreational, educational and volunteer opportunities.
- http://townofstmarys.com/living/friendship_centre.aspx?id=153

St James Anglican Church
- Lists times of services, church programs, current photos and a brief history of the building.
- http://www.crossspot.net/stmarysont/

St Marys Ontario Churches
- A directory to the places of worship in St.Marys, with photos and maps.
- http://stmarysont.topcities.com/

St. Marys Gospel Hall
- Worship schedule, beliefs, and history.
- http://stmarysont.topcities.com/churchgh.htm

Ontario Heritage Properties
- A map of heritage properties in the town of St. Marys, with current photo and a brief description of each.
- http://stmarysheritage.bravehost.com/

The Grand Trunk Trail
- A community fund raising effort to convert the former Grand Trunk Railway line to an environmentally complementary trail having a panoramic view of town.
- http://stonetown.com/gttsm/