designations as metropolitan or micropolitan statisticalareas in their respective larger combinedstatisticalareas. The primary distinguishing factor between
primary statisticalareas (PSAs) include all combinedstatisticalareas and any core-based statisticalarea that is not a constituent of a combined statistical
county-equivalents Listof United States urban areas United States Office of Management and Budget Statisticalarea (United States) Combinedstatisticalarea (list) Core-based
Delineations of Metropolitan StatisticalAreas, Micropolitan StatisticalAreas, and CombinedStatisticalAreas, and Guidance on Uses of the Delineations of These