Area code 289 is an overlay for southern Ontario, Canada, sharing coverage with 905 and 365. It includes suburban and exurban areas surrounding Toronto, such as Mississauga, Hamilton, Burlington, Oakville, and Niagara Falls. The region is known for its economic diversity, blending manufacturing, logistics, technology, and tourism. Mississauga is a major business hub home to hundreds of corporate headquarters, while Hamilton maintains a strong industrial base supported by McMaster University and a growing healthcare sector. Niagara Falls draws millions of tourists annually and supports a thriving hospitality industry. As population and business activity continue to expand outside of Toronto’s core, overlays like 289 help accommodate the demand for new numbers while retaining strong local identity. A 289 number offers instant recognition within the Greater Toronto and Golden Horseshoe regions and provides a reliable foundation for businesses, professionals, and service providers operating across Ontario’s southern growth corridor.