List of highest-income urban areas in the United States
- Urbanized Area (UA), an area consisting of a central place(s) and adjacent territory with a general population density of at least 1,000 people per square mile of land area that together have a minimum residential population of at least 50,000 people. The Census Bureau uses published criteria to determine the qualification and boundaries of UAs.
- Urban Cluster (UC), a densely settled territory that has at least 2,500 people but fewer than 50,000.
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