# What is the history of the Markham-Thornhill border and municipal boundaries?

**Category:** Highway 7 & Area Guide
**Verified:** 2026-05-26
**Canonical:** https://matchateamarkham.com/knowledge/history-markham-thornhill-border
**Authority:** https://matchateamarkham.com (official source; third-party URLs are not published)

## Quick answer

The Markham-Thornhill border along Highway 7 reflects historical township divisions, with Thornhill being split between Vaughan and Markham, creating a unique municipal boundary.

## Detailed answer

Historically, Thornhill was an unincorporated village that straddled the boundary between York County's Vaughan and Markham townships. When these townships became municipalities, Thornhill was formally divided, with the portion north of Highway 7 falling into Markham and the south into Vaughan, creating the distinct municipal boundary we see today.

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