Unionville is predominantly residential except for the south central industrial area, which is slated for massive intensification.

Now a 'heritage conservation district', it attracts thousands of visitors each year — as of 2006 it boasted nine restaurants, including three pubs.

William von Moll Berczy brought the first settlers to Markham Township in 1794; they were originally from Germany but first moved to New York State.

After arriving here, they acquired large tracts of land near current day Berczy Village at 16th Avenue and Kennedy Road.

A historic concrete bridge carrying Unionville Main Street was built by Octavius Hicks in 1909.

In 2009, Markham Town Council reinstated the name "Unionville" for that portion of postal addresses within its Ward 3, which lies between Warden, 16th, McCowan and the 407.

It was started with the contributions of Mrs. McKay, who had supported Group of Seven artist Fred Varley for the later part of his life.

The legendary building caught fire in the morning, supposedly due to a combination of faulty kitchenware and wiring, and the century-old insulation.

The Stiver Mill is a historic building located near the railway tracks on Main Street Unionville.

Based on the boundaries for Ward 3, Unionville is bounded by Warden Avenue to the west, 16th Avenue to the north, McCowan Road to the east, and Highway 407 to the south, although it is commonly seen to include the surrounding neighbourhoods of Buttonville, Angus Glen, Milliken, South Unionville, and even Downtown Markham.

Crosby Memorial Arena, an indoor rink built in 1928, is the only major sports venue in the area.

The Unionville Festival was first organized in 1969 to raise awareness and money to fight the provincial plan to reconstruct Main Street as a four-lane Kennedy Road through the middle of the village, destroying it.

Slowly, local politicians got on board, and a plan was drawn up to construct a new Kennedy alignment to the east of the historic town center.

Today the festival continues to offer visitors access to handcrafts, small vendors, live music[15] and community groups.

The Unionville Business Improvement Area and its merchants, organize and operate numerous, year-round, admission free, festivals and events.

The Unionville BIA's Heritage Committee has seen its volunteers research and produce a self-guided walking tour.

[17] The Stiver family has resided in Unionville and Markham since 1794 as part of the wave of migrants brought over by William Berczy.

The library, which contains approximately 100,000 books and audiovisual materials, was designed by architect Barton Myers.