There are two main places named Halifax commonly referenced: Halifax, Nova Scotia, Canada, and Halifax, West Yorkshire, England. Here's how big each is: Halifax, Nova Scotia, Canada:

• The Halifax Regional Municipality (HRM) covers about 5,475.57 square kilometers (2,114.13 square miles).
• The Halifax Census Metropolitan Area (CMA), including nearby communities, covers around 7,276.22 square kilometers (2,809.36 square miles).
• The urban area specifically around Halifax Harbour covers about 238.29 square kilometers (92 square miles).
• Population is approximately 530,167 in the metropolitan area and 348,634 in the urban area as of 2024 estimates.

Halifax, West Yorkshire, England:

• It is a large town with a population of about 88,109 (2021).
• The urban area population was about 82,056 in 2001.
• The town is much smaller geographically compared to its Canadian namesake but a significant market town in the Metropolitan Borough of Calderdale.

So, Halifax, Nova Scotia is a large metropolitan area spanning over 5,000 square km, while Halifax in West Yorkshire is a smaller town and urban area with a population under 100,000. The Canadian Halifax is much bigger in both area and population.