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The City of Kingston is a single-tier municipalitynot under the jurisdiction of an upper-tier municipality such as Frontenac County and thus, is outside of the geographic limits of Frontenac County for municipal purposes. For geographic purposes however, Kingston is within the geographic limits of Frontenac County. The City of Kingston forms part of the county's census division.
The numbered roads in this list are not under the jurisdiction of Frontenac County (only their numbers are, for coordination); the responsibility for their maintenance is with the individual townships (and City of Kingston). As a result, the "flowerpot" municipal road shields are signed with the name of the township, such as Central Frontenac, Kingston or Wolfe Island (for Frontenac Islands Township). South Frontenac Township makes reference to its numbered township highways as Township Road n in law.
Former Highway 506, now signed North Frontenac Road 506 as it is under the jurisdiction of North Frontenac Township
"Flowerpot" shield with South Frontenac and a route number
Kingston Road 11
Township Road 38
Highway 15
County Road 13
Highway 2
Highway 401
Highway 7
Highway 41
List of County roads