The Eastern Ontario Wardens' Caucus is composed of 13 members across rural Eastern Ontario, including 11 regional County municipalities and two Single-tier municipalities. To learn more about each individual member municipality, please visit the following websites:
- County of Frontenac
- County of Haliburton
- County of Hastings
- City of Kawartha Lakes
- County of Lanark
- United Counties of Leeds and Grenville
- County of Lennox and Addington
- County of Northumberland
- County of Peterborough
- United Counties of Prescott and Russell
- County of Prince Edward
- County of Renfrew
- United Counties of Stormont, Dundas and Glengarry