York Region Transit Southeast Division

YRT Southeast Division is one of four YRT operational divisions. This division covers the majority of routes in the towns of Markham and Stouffville, with some routes in Richmond Hill and Vaughan also part of Southeast's jurisdiction.

Miller Transit Ltd. is the contractor for the Southeast division. Service is operated out of their yard, located on Woodbine Avenue south of Highway 407. Miller operated Markham Transit's system until amalgamation, and was also awarded the contract for Richmond Hill operation in 2003 after the contract with Pacific Western was not renewed. Miller has been the highest ranked contractor in York Region since 2008.

Routes
Southeast division is broken into two operational halves, known as 'Markham' and 'Richmond Hill'. Drivers and vehicles are both separated between these two portions, although it is not uncommon to see vehicles allocated to one area operating in the other.

Markham
The Markham area is responsible for the following routes operating primarily in Markham and Stouffville:
 * 1 Highway 7
 * 2 Milliken
 * 14 14th Ave
 * 8 Kennedy
 * 9 Ninth Line
 * 15 Stouffville Local
 * 18 Bur Oak
 * 40 Unionville Local
 * 41 Markham Local
 * 42 Berczy
 * 45 Mingay
 * 201 Markham GO Shuttle
 * 202 Unionville GO Shuttle
 * 224B Woodbine
 * 300 Business Express
 * 301 Markham Express
 * 302 Unionville Express
 * 303 Bur Oak Express

Richmond Hill
The Richmond Hill area is responsible for the following routes operating primarily in Richmond Hill:
 * 81 Inspiration
 * 82 Valleymede-Spadina
 * 83/83A Trench
 * 16 16th Avenue
 * 86 Weldrick-Newkirk
 * 90/90B Leslie
 * 91/91A/91B/91E Bayview
 * 98E Yonge Limited Express
 * 99 Yonge
 * 240 Mill Pond GO Shuttle
 * 241 Beverly Acres GO Shuttle
 * 242 North Richvale GO Shuttle
 * 243 Redstone GO Shuttle