To qualify as an outlying municipality, the municipality must have at least 1.5% of its resident population aged 15 and above commuting to school or work into one of the central cities. To qualify as a central city, a city must either be a designated city of any population or a non-designated city with a city proper population of at least 500,000.
For an outlying municipality to meet the criteria, it needs to have at least 1.5% of its residents aged 15 and above traveling to school or work in one of the larger urban areas. To be considered a central city, a town must either be a formally designated urban area with any population size or a non-designated urban area with a population of over 500,000.