All Züm routes (with the exception of one) continue into neighbouring municipalities, namely Mississauga, Vaughan, and Toronto (Humber College Bus Terminal).

The Züm network directly connects to these neighbouring transit agencies, in some cases overlapping with their routes for considerable distances.

This includes the 501 Züm Queen in Vaughan running alongside Viva Orange from Highway 50 east to Vaughan Metropolitan Centre subway station, 502 Züm Main running alongside 103 Hurontario Express from Highway 407 south to Mississauga City Centre Transit Terminal (next to Square One Shopping Centre) and 505 Züm Bovaird (both into Mississauga) running alongside MiWay and TTC routes to Toronto Pearson Viscount Station or into Toronto.

Four routes run north into Caledon to provide service to urbanized areas bordering Brampton as well as the community of Bolton in the otherwise rural municipality.

GO is an interregional agency that provides higher-order transit links Brampton to Toronto and other cities in the Golden Horseshoe.

There is also an on-demand bus service operating in the industrial area around Dixie Rd/Advance Blvd, previously served by the former route 40. to UPS Caledon limited service onlyvia Bramalea Terminal via Gore Meadows Community Centre Suspended[8] BT has an active fleet of 375+ buses including: Retired models include: Brampton Transit Transit Enforcement Officers patrol in white hybrid vehicles (Ford Fusion, Toyota Camry) with red and blue stripes.

502 Züm Main opened in 2011 and runs North & South along Main/Hurontario Street from Sandalwood Loop to Mississauga City Centre Transit Terminal (Square One).

A north-to-south extension along Airport Road to Malton GO station was opened in 2018, realigning the route while no longer servicing the Queen Loop.

A proposed Zum Route along Chinguacousy Road[11] will connect the Cassie Campbell Community Centre[12] at Sandalwood Parkway, to Bramalea GO Station via Steeles Ave.

On November 16, 2011, a Züm bus on the 501 Queen route crashed through a noise wall after colliding with an SUV on Highway 7 in Vaughan, sending five people to the hospital.

[13] In the early hours of October 9, 2024, another Züm bus, this one not in service and carrying no passengers, crashed at a sharp angle through a similar wall along Bovaird Drive after colliding with a car, demolishing fences as it plowed through several backyards, although there were no injuries.