The southern boundary conforms with a position approximately 200 m (660 ft) north of 19th Avenue (York Regional Road 29), and is irregular due to the annexation of lands formerly part of Markham Township in 1971.

[10] The intent of these statutes is to prevent urban sprawl on environmentally sensitive land and to protect the ecological integrity of the moraine and its hydrological features.

Both groups were seeking religious freedom, and were identified by the Upper Canadian government as people with necessary skills and abilities for establishing viable communities that could, in turn, attract others to settle in the region.

[25] The Crown also granted land in Upper Canada to mercenary German Hessian soldiers, such as Stegman, in exchange for their service against the Thirteen Colonies in the American Revolution.

"[32] Stouffville was considered a centre "of Radical opinion," one of the "hotbeds of revolution," and it was here that William Lyon Mackenzie set forth his plan for the Upper Canada Rebellion of 1837–38.

[33] The hamlet of Stouffville grew rapidly in the 1840s, and by 1849, it had "one physician and surgeon, two stores, two taverns, one blacksmith, one waggon maker, one oatmeal mill, one tailor, one shoemaker.

[45] Yet similar environmental consequences due to increased urbanization were projected in 2007 by the Toronto and Region Conservation Authority as probable for southern Whitchurch–Stouffville (headwaters of the Rouge River watershed) if targeted plantings in this area did not begin quickly.

"[47] Though growth in the hamlets of Whitchurch–Stouffville was stagnant after the demise of the forest industry, the population began to grow again in the 1970s, with development in Metropolitan Toronto and the consequent arrival of new commuters.

The dove of peace, the original seal of Whitchurch Township, is at the crest, recalling the pacifist Quaker and Mennonite settlers who founded many of the town's communities, including Stouffville.

Between 1962 and 1969, hundreds of thousands of litres per month of sulfuric acid, calcium hydroxide, and oil waste were poured into unlined Whitchurch–Stouffville dumps never designed as landfill sites and situated directly above the town's main aquifer.

[50] Though the Ministry of Environment was satisfied that the wells tested in 1974 and 1981 had negligible levels of cancer causing agents (mutagens), the town opposed the expansion of the "York Sanitation Site #4".

[51] In 1984 it was reported in the Legislative Assembly of Ontario that PCBs were found in well-water, and that 27,000 gallons of contaminated leachate per day were leaking from the site, threatening ground water quality.

[54] Not unlike the late 19th century, responsible land and water stewardship, as well as the positive integration of many new residents annually into the community, define the challenges and opportunities for Whitchurch–Stouffville in the years to come.

[66] In a few cases the retreating glacier left behind and buried huge blocks of ice which, when melted, created deep, water-filled depressions known as kettle lakes.

The southern sections (south of Bloomington Road) make up the headwaters of the Rouge River and Duffins Creek, both of which flow into the Lake Ontario basin.

Their identification and protection, plus reforestation in these area, has been identified as urgent for rebuilding water-capacity in the Rouge River watershed which can off-set the worst environmental impacts (e.g., flash flooding, erosion and ground water contamination) of rapid urbanization.

Three groundwater wells are in close proximity to the settlement area of Stouffville (Main Street, east of 10th Line); consequently 239 "significant drinking water threats" have been identified.

A major pathway for airborne pollutants flows from the upper Midwest United States and the Ohio River Valley and across southern Ontario and Toronto; key sources are coal-burning power-plants and vehicle engines.

The most common non-European ethnic origins represented in Whitchurch-Stoufville as per the 2021 census are Chinese (17%), Indian (India) (5.2%), Sri Lankan (3.2%), Filipino (3%), and Tamil (2.8%).

In 1994, a plan to connect urban Stouffville directly to Highway 401 via the proposed East Metro Freeway was cancelled in large part due to the concerns of residents and the work of the Rouge River activist groups.

[95] Excellent public transportation options is an increasingly urgent issue for Whitchurch–Stouffville as the town continues to grow with residents who commute daily to Toronto (see Economy below).

"[99] Historic downtown Stouffville offers casual eateries, cafes, pubs, fine dining restaurants, and a variety of boutique stores.

[121] Under the Oak Ridges Moraine Conservation Act (2001), future aggregate resource operations must meet stringent review and approval standards.

[123] Since 2009, the town's economic development strategy has focused on small and large knowledge-based industries, agricultural and environmental services, and not-for-profit organizations.

[134] Social services in Whitchurch–Stouffville include the Whitchurch–Stouffville Food Bank and the Care and Share Thrift Store (Mennonite Central Committee), both located on Ringwood Drive in the Community of Stouffville.

The first organized sport in Stouffville was curling in 1890 on the Mill Pond (today site of the Latcham Art Gallery and the Mennonite Care and Share Thrift Store).

[162] In June 2011 local book clubs and individuals began a grass-roots campaign to petition for greater municipal funding for the public library.

[164] A 2014 expansion design was rejected by the newly elected Town Council in 2015, and the minimum space requirements for a community library were vigorously challenged.

The museum site includes five historic structures from the former Township of Whitchurch: the Bogarttown Schoolhouse (1857), a pioneer log cabin (c. 1850), a Victorian Farmhouse built by James Brown (1857), a barn (c. 1830) and Vandorf Public School (1870).

[174] Movies partially shot on location in the community of Stouffville include: The Russell Girl (2008), Stir of Echoes: The Homecoming (2007), Who Killed Atlanta's Children?