Which of the following describes an urbanized area threshold?

• A. It must include a central city with 25k population
• B. It must have a core density of 500 per square mile
• C. It must have a metro population of 120k
• D. It must have 50k or more population with a core density of 1,000 per square mile

Answer: (D)

An urbanized area designation is given only when the area has enough people and a dense core to be truly urban. The threshold combines a population floor with a minimum core density to ensure both scale and density. The specified requirement—50,000 or more people with a core density of 1,000 people per square mile—matches how urbanized areas are defined, ensuring the core is densely settled and the area functions as a single urban region. A central city of 25,000 falls short of the population criterion, and a core density of 500 per square mile is below the density criterion, so those options don’t meet the standard. A metro population figure refers to the broader metropolitan area, not the urbanized area’s specific core-plus-density threshold.