As of July 5, 2011 the  Toronto MLS introduced the new redistricting map, which affected the way realtors search for properties for theit clients. There were few changes in the City of Toronto, but there was a major change in the North GTA area. There are no more N01, N02, etc...areas, Each community received a name and has specific borders. The biggest change occured in the area North of Highway 7, south of Teston Road, between West of Dufferin and Bathurst. It is now called "Patterson" and includes communities known as: Thornhill Woods, Dufferin Hill, Valleys of Thornhill, Upper Thornhill estates, Eagles Hill, Roxborough.

Please see the map below to get an idea of the changes in names and borders of the areas.The map shows the borders of the new Patterson area and all other communities (just enter the address, postal code or city, click "v" for all options, then click the "Search" button (you can zoom in on your area of interest):

http://www.torontomls.net/BingCommunitiesMap/map.html