Stouffville (/ˈstoʊvɪl/) is the primary urban area within the town of Whitchurch-Stouffville in York Region, Ontario, Canada. It is situated within the Greater Toronto Area and the inner ring of the Golden Horseshoe. The urban area is centred at the intersection of Main Street (York Regional Road 14), Mill Street, and Market Street. Between 2006 and 2011, the population of the Community of Stouffville grew 100.5% from 12,411 to 24,886, or from 51% to 66% of the total population of the larger town of Whitchurch-Stouffville.^[2] The population of Stouffville from the 2021 census is 36,753. ^[3]

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Stouffville
Unincorporated town
Motto:  Country close to the City
Location within York
Coordinates: 43°58′N 79°15′W
Country	Canada
Province	Ontario
Regional municipality	York Region
Town	Whitchurch-Stouffville
Incorporated	Village of Stouffville 1877
Amalgamation (with Whitchurch Township)	January 1, 1971
Government
• MPP	Paul Calandra
• MP	Helena Jaczek
Area [1]
• Land	14.17 km2 (5.47 sq mi)
Elevation	266 m (873 ft)
Population  (2021)[1]
• Total	36,753
• Density	2,593.6/km2 (6,717/sq mi)
Time zone	UTC−05:00 (EST)
• Summer (DST)	UTC−04:00 (EDT)
Forward sortation area	L4A
Area code(s)	905, 289, 365, and 742
Website	www.town.whitchurch-stouffville.on.ca

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Founded in 1804 by Abraham Stouffer, the hamlet was originally named Stoufferville.^[4] Stouffer built a sawmill and grist-mill^[5] on the banks of Duffin's Creek in the 1820s.^[6] The community name was shortened to Stouffville when its first post office opened in 1832.^[7]

In 1877, Stouffville became an incorporated village.^[8] On January 1, 1971, the Village of Stouffville amalgamated with Whitchurch Township and was designated a community within the larger town of Whitchurch-Stouffville; with amalgamation, the boundary of the town was also moved four farm lots south of the original boundary of Main Street (the land was formerly a part of Markham Township). The population of urban Stouffville in 1971 was 5,036.^[9]

In 2003, a large 16th-century Huron village was discovered in Stouffville during land development; approximately 2000 people once inhabited the site, dubbed Mantle Site, which included a palisade and more than 80 longhouses, yielding tens of thousands of artifacts.^[10]

Urban Stouffville is approximately 4.5 km long, stretching from the York-Durham Line to Highway 48, and approximately 2.7 km wide with development north and south of Main Street. Stouffville is bounded by farmland and a golf course. The community is located on the Oak Ridges Moraine and the Rouge River watershed.

GO Transit's Stouffville line passes through the community with commuter trains stopping at the Stouffville GO Station in the downtown core and terminating at Old Elm GO Station. When no trains are scheduled a bus service from Toronto serves the town with some runs continuing to Uxbridge.^[11]

York Region Transit's bus#15 travels around the community of Stouffville and along the Stouffville Road to Yonge Street in Richmond Hill,^[12] and their bus#9 (9th line) travels from the town to Markham Stouffville Hospital and thence to Box Grove Plaza.^[13]

Stouffville Road (Regional Road #14) is the main east-west route that passes through downtown and connects with Highway 404 in the west.

In 2006, urban Stouffville had a population of 8,000 to 10,000 people, or about one-third of the population of the larger Town of Whitchurch-Stouffville.^[14] The Town of Whitchurch-Stouffville estimates that the population grew more than 58% between 2006 and 2011; most of that growth was limited to the Community of Stouffville or the Community of Ballantrae.^[15] Based on the 2021 census the town's total population is 36,753, growth of 8.8% from the 2016 population of 32,634.

With connection to a massive new sewage system (also known as the Big Pipe) and a water pipe from Lake Ontario, urban Stouffville began to grow rapidly after 2005. The first of the new subdivisions were south of Main Street along Hoover Park Drive (Wheler's Mill and Wheler's on Main subdivisions), and north of Main Street along Millard Street west of Ninth Line.

In 2008, construction began to widen Stouffville Road / Main Street from two lanes to four lanes, from Ninth Line to the edge of urban Stouffville at Highway 48 (the community of Ringwood), and further to McCowan Road. Construction was completed in June 2010. Stouffville Road has since been widened up to Highway 404.

• Keith Acton, National Hockey League player and coach
• Capt. Arthur Roy Brown DSC and Bar, RNAS (23 December 1893 – 9 March 1944), World War I flying ace who spent the latter years of his life running a farm in Stouffville.
• Michael Del Zotto, National Hockey League player
• Nicole Dollanganger, musician^[16]
• Peter Gibbons, racing driver
• Dalton Kellett, racing driver
• Liz Knox, Canadian Women's Hockey League player; Professional Women's Hockey Players Association founding board member and player
• Jeff Marek, NHL and CHL analyst for Sportsnet
• Brad May, National Hockey League player; Stanley Cup winner with the Anaheim Ducks
• Jane Philpott, former President of the Treasury Board and MP of the Liberal Party of Canada
• Dean Michael Wiwchar, hitman.
• (See also Notable residents, Whitchurch-Stouffville)

Urban Stouffville is situated in the southeast corner of the town of Whitchurch-Stouffville. Neighbouring communities within the town include Ringwood and Gormley to the east, and Bloomington to the north. Claremont, Uxbridge, and the ghost town of Altona (part of Pickering) lie to the east. Stouffville is bordered on the south by the city of Markham.