This is a list of numbered county roads in Lanark County, Ontario. Connecting road segments (some not maintained by the county) are named in parentheses.
County Road # Local name(s) Northern/Eastern Terminus Southern/Western Terminus Settlements served Additional Notes 1 Rideau Ferry Road South Street Rideau Canal Perth, Rideau Ferry continues as Leeds & Grenville County Road 1 to Lombardy 2 Heritage Drive City of Ottawa limits Grenville County limits continues as City of Ottawa Road 2 to Becketts Landingcontinues as Leeds & Grenville County Road 15 to Merrickville 4 Cornelia Street East Montague Boundary Road (at the City of Ottawa Limits where it meets the Montague Township limits) Highway 15 Smiths Falls, Montague continues as City of Ottawa Road 6 where the name changes to Roger Stevens Drive and continues to North Gower 6 Althorpe RoadChristie Lake RoadSunset Boulevard County Road 43 County Road 36 Althorpe, DeWitts Corners, Glen Tay, Perth 7 Fallbrook Road County Road 511 County Road 12 Playfairville, Fallbrook, Balderson 7B Townline Road WestTownline Road East County Road 29 Highway 7 Carleton Place 8 Watsons Corners Road(County Road 511)Herron Mills Road6th Concession C Lanark County Road 16 County Road 511 Herron Mills, Watsons Corners, McDonald's Corners 9 Tatlock Road Highway 7 County Road 511 Union Hall, Clayton, Halls Mills, Tatlock9AMcIlraith RoadTatlock marble quarryCounty Road 511dead-end road, cut off from continuing to County Road 9 (Tatlock Road) by marble quarrynot signed 10 Scotch LineSouth Street(Gore Street East)(Gore Street West)(North Street)Drummond Concession 2Perth Road(Highway 15)Richmond Road Ashton Station Road Leeds County limits Franktown, Perth, Scotch Line shares Gore Street East, Perth, with County Road 43part of a relay of County Roads 10 linking Richmond to Kingston 11 Wilson StreetRiver Road County Road 17 County Road 29 Appleton 12 McDonald's Corners RoadMarkle RoadMill StreetSouth StreetPine Grove Road County Road 15 County Road 36 Lanark, Playfairville, McDonald's Corners, Elphin 14 Narrows Lock Road County Road 10 Rideau Canal Black Lake, Narrows Lock continues as Leeds & Grenville County Road 14 to Crosby 15 Fergusons Falls Road Highway 7 County Road 511 Fergusons Falls 16 South Lavant Road(County Road 511)Wolf Grove RoadAlmonte Street County Road 29 Frontenac County limits Lavant, Poland, Hopetown, Middleville, Union Hall, Almonte 16A Perth StreetBridge StreetQueen StreetMartin Street South County Road 17 County Road 29 Almonte 17 Blakeney RoadPanmure RoadMartin Street North(Ottawa Street)Appleton Side RoadCemetery Side RoadDerry Side Road County Road 20 County Road 10 Pakenham, Blakeney, Almonte 18 Port Elmsley Road County Road 1 County Road 43 Port Elmsley 19 Bennett Lake Road County Road 7 County Road 36 Fallbrook, Pratt Corners 20 Waba Road(County Road No. 29 North)Kinburn Sideroad Timmins Road Robertson Line Pakenham continues as City of Ottawa Road 20 to Kinburn 21 Lally RoadElm Grove Road County Road 1 County Road 14 Murphy's Point Provincial Park 22 Shaw Road Lunney Road County Road 20 Pakenham Township minor connecting route 23 Rosedale Road South County Road 4 County Road 43 Rosedale 24 Campbell Side Road4th Concession PakenhamBellamy RoadPeneshula Road County Road 20 Snye Road Uneeda, Pickerel Bay 29 County Road No. 29 NorthChristian StreetCounty Road No. 29 SouthTownline Road EastMcNeely Avenue Walter Bradley Road Highway 7 Pakenham, Almonte, Carleton Place continues as City of Ottawa Road 29 to Highway 417 at Exit 180 36 Snow RoadElphin Maberly RoadMaberly Elphin RoadBolingbroke Road Frontenac County limits Leeds County limits Elphin, Maberly, Bolingbroke continues as Leeds & Grenville County Road 36 to Westport 43 County Road 43(Queen Street)(Elmsley Street South)(Elmsley Street North)(Cornelia Street West)(Craig Street)(Gore Street East)(North Street)(Wilson Street West) Grenville County limits Highway 7 Smiths Falls, Port Elmsley, Perth Formerly Highway 43; shares Gore Street East, Perth, with County Road 10;continues as Leeds & Grenville County Road 43 to Merrickville;no longer signed within Perth town limits 49 March Road Golden Line Road County Road 17 Almonte continues as City of Ottawa Road 49 to Highway 417 at Exit 155 511 Lanark RoadHighway 511South StreetGeorge Street Renfrew County limits Highway 7 Perth, Balderson, Lanark, Hopetown continues as Renfrew County Road 511 to Calabogie(Note: 511 was a former secondary highway before it was downloaded to Lanark and Renfrew counties)
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