Which statement about urbanized area thresholds is true?

• A. It requires a population of 80k with density 2k per square mile
• B. It requires 50k+ population with core density 1,000 per square mile
• C. It requires a census tract of 3k
• D. It requires a metropolitan population of 250k

Answer: (B)

Urbanized areas are defined by a minimum population size and a density threshold in the core. The accurate rule is that an urbanized area has at least 50,000 people in total, and the core must reach a density of at least 1,000 people per square mile. This combination captures both the size and the built-up intensity of the area.

The option that states this minimum combination correctly matches the official definition. The other statements misstate the criteria: fixing a higher population number (like 80,000) or a higher core density (like 2,000 per square mile) goes beyond the minimum threshold and isn’t how urbanized areas are defined; defining an area by a single census tract or by metropolitan population alone doesn’t reflect the actual UA criteria, which center on the continuous, densely developed urbanized footprint.