Thornhill Neighbourhood Guide: Every Community in L3T and L4J

The short answer

Thornhill is not its own city. It is a community that sits in two cities at once, split down the middle by Yonge Street. Everything east of Yonge is in the City of Markham and mostly carries the postal code L3T. Everything west of Yonge is in the City of Vaughan and mostly carries the postal code L4J. My office is at 60 Green Lane in Thornhill, so this is the area I work in every day.

Broadly, Thornhill runs from Steeles Avenue (the Toronto border) north to Highway 7 and the 407, and from about Dufferin Street in the west to Highway 404 in the east. On the Vaughan side, newer communities like Thornhill Woods carry the Thornhill name north of the 407 toward Rutherford Road.

Thornhill was settled in 1794 and the two halves together are home to over 110,000 people, according to the 2016 Census.

Markham or Vaughan: why it matters when you buy

Two homes a few minutes apart can sit in different cities. That changes:

• Property tax rates, which are set separately by Markham and Vaughan.
• City services, such as garbage pickup, community centres and recreation programs.
• Planning rules, including what you can build, add or sever on your lot.
• School boundaries, because school attendance areas follow their own lines.

Neither city charges a municipal land transfer tax, so buyers here pay only the Ontario land transfer tax. That alone can save thousands compared with buying a few blocks south of Steeles in Toronto. My full breakdown is in Closing costs in Ontario.

Comparing Thornhill with nearby areas? See my guides to Markham, Vaughan, Richmond Hill and North York.

Thornhill East (Markham side, L3T)

These are the communities as they are grouped on the Toronto Regional Real Estate Board (TRREB) system, which is how listings and sold data are reported.

Thornhill (the heritage village)

The original village sits along Yonge Street around John Street and Centre Street, on both sides of Yonge. Much of it is in a Heritage Conservation District, so exterior changes and additions go through a heritage review. You will find older homes on mature lots and quick access to the Thornhill Community Centre on John Street. If you love character homes, this is the pocket to watch, but plan for the extra approvals if you want to renovate.

Royal Orchard

Royal Orchard sits east of Yonge, north of the old village and south of Highway 7, along Royal Orchard Boulevard. It is known for large detached homes on generous ravine lots near the East Don River valley trails, plus newer condos close to Yonge. A future subway station is planned at Yonge and Royal Orchard, which matters for anyone buying here for the long term.

Grandview

Grandview runs north of Steeles between Yonge and Bayview. It has a mix of detached homes, semis and townhouses, with some of the most direct access to Toronto in all of Thornhill. Future Steeles and Clark subway stations sit right on its western edge.

Bayview Glen

Bayview Glen is the area around Bayview Avenue north of Steeles. It is a quiet, established neighbourhood of larger detached homes, many on wide lots, with easy access to Bayview's shops and to the 407 and 404.

Bayview Fairway and Bayview Country Club Estates

This pocket sits east of Bayview near Steeles, around the Bayview Golf and Country Club. It is one of the more exclusive parts of Thornhill, with large custom and executive homes. Inventory is limited, so buyers here usually need patience and a fast decision when the right home comes up.

German Mills

German Mills sits east of Bayview toward Leslie Street, around German Mills Settlers Park and the creek valley. It is mostly detached homes from the 1970s and 1980s on solid lots, with lots of green space. Families like it for the parks and the quiet streets.

Aileen-Willowbrook

Aileen-Willowbrook sits north of John Street between Yonge and Bayview. It is a family neighbourhood of detached homes, semis and townhouses with parks and schools inside the community, and easy access to Centre Street and Highway 7.

Thornlea

Thornlea runs east of Bayview to about Leslie, north of John Street toward Highway 7. It is mostly detached homes with a strong neighbourhood feel, and it is close to Thornlea Secondary School and the Pomona Mills Park trails.

Langstaff South and Commerce Valley

These two pockets sit near Yonge and Highway 7 and near Leslie and Highway 7. They are where most of the new condo and townhouse building is happening on the Markham side, close to the 407, Langstaff GO and the future subway. For first time buyers and investors, this is often the most affordable way into a Thornhill address.

Thornhill West (Vaughan side, L4J)

Crestwood-Springfarm-Yorkhill

This is the area between Yonge and Bathurst from Steeles up toward Centre Street. Homes are mostly detached and semi detached from the 1960s and 1970s, with mature trees and good lot sizes. It includes Yorkhill Elementary and York Hill District Park. Many buyers here plan a renovation or a rebuild down the road.

Uplands

Uplands sits west of Yonge, south of Highway 7, around the Uplands Golf and Ski Centre. It is a smaller, quieter community of detached homes and townhouses, with the golf course and ski hill right in the neighbourhood.

Brownridge

Brownridge sits west of Bathurst around Centre Street and the Promenade Shopping Centre. It has a mix of detached homes, townhouses and condos, with shopping and transit along Centre Street close by.

Beverley Glen

Beverley Glen sits near Bathurst and Centre around Beverley Glen Boulevard, close to the Promenade. It is known for detached and semi detached homes and townhouses, with places of worship, community centres and day schools within walking distance for many families.

Patterson and Thornhill Woods

North of Highway 7 and the 407, between Bathurst and Dufferin, the Thornhill name continues into Thornhill Woods, which TRREB reports as part of Patterson. These are mostly newer detached homes and townhouses built from the late 1990s onward, on curving family streets with newer schools and parks. You get more house for the money than in the older south end, in exchange for a longer drive to the subway.

Lakeview Estates

Lakeview Estates sits in the north part of Thornhill on the Vaughan side. It is a smaller community of newer detached homes, popular with families who want a newer build with a Thornhill address.

Transit and commuting

• Yonge North Subway Extension: Metrolinx is building about 8 kilometres of subway north from Finch Station, with five new stations at Steeles, Clark, Royal Orchard, Bridge and High Tech. Three of those stations are in or right next to Thornhill. The launch shaft for the tunnel boring machines was finished in 2026, but Metrolinx has not published an opening date.
• GO Transit: Langstaff GO on the Richmond Hill line is just north of Thornhill near Yonge and Highway 7.
• Highways: the 407 runs along the north edge, the 404 along the east edge, and the 401 is a short drive south.
• Buses: YRT and Viva run along Yonge, Centre Street, Bathurst and Highway 7, and TTC routes connect at Steeles.

Schools, parks and things to do

Schools. Thornhill is served by the York Region District School Board and the York Catholic District School Board. High schools in the area include Thornhill Secondary, Thornlea Secondary, Westmount Collegiate Institute, St. Elizabeth Catholic High School and St. Robert Catholic High School. There are also several private and faith based day schools. School boundaries change, so before you buy, always check the address on the board's school locator, not just the listing.

Parks and trails. Highlights include Pomona Mills Park, Royal Orchard Park, Thornhill Park, Baker's Woods, Oakbank Pond Park, York Hill District Park, German Mills Settlers Park and the East Don River valley trails.

Golf. Thornhill has three historic courses, all opened in the 1920s and designed by Stanley Thompson: the Thornhill Club, Uplands and the Ladies Golf Club of Toronto. The Thornhill Club hosted the 1945 Canadian Open.

Shopping. The Promenade Shopping Centre at Bathurst and Centre, plus plazas along Yonge, Bayview, Centre Street and Highway 7.

Common questions about Thornhill

Is Thornhill in Markham or Vaughan?

Both. East of Yonge Street is the City of Markham and west of Yonge is the City of Vaughan. Your property tax bill, city services and planning rules depend on which side of Yonge the home is on.

What postal codes are in Thornhill?

The Markham side mostly uses L3T and the Vaughan side mostly uses L4J. Some newer buildings and the north end can use nearby codes, so check the exact address.

Is Thornhill a good place to buy a home?

For many families, yes. You get established neighbourhoods, large parks and ravines, good access to Toronto, and a subway extension on the way. The right pocket depends on your budget, the school you want and whether you prefer an older home on a big lot or a newer build.

Do I pay Toronto land transfer tax in Thornhill?

No. Thornhill is in Markham and Vaughan, which do not charge a municipal land transfer tax. You pay only the Ontario land transfer tax.

When will the Yonge subway reach Thornhill?

Construction is underway, but Metrolinx has not published an opening date. Homes near the planned Steeles, Clark and Royal Orchard stations are the ones most likely to feel the impact once it opens.

Thinking about buying or selling in Thornhill?

Every pocket in L3T and L4J moves at its own pace, and the citywide average rarely tells you what your street is doing. If you want recent sold prices for a specific community, or a value for your own home, send me a message or call me at 647-965-7834.