County roads, or arterial roads, are maintained by the United Counties of Leeds and Grenville. These include:
- County Road 2
- County Road 3 (Prince St., Reynolds Rd., Outlet Rd.)
- County Road 4 (Quabbin Rd., Rockfield Rd., Warburton Rd.)
- County Road 13 (South Lake Rd.)
- County Road 32
- County Road 33 (Lyndhurst Rd.)
- County Road 35 (Station Rd.)
- County Road 34 (King Street West, Eden Grove Rd., Hiscocks Rd.)
- County Road 37 (Howe Island Ferry Rd., East)
- County Road 42
- County Road 47 (Main Street in Seeley's Bay)