Table 12-1. (cont.)
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Density requirement
At least 1,000 people per square mile
Place population in urban fringe
- Incorporated places with at least 2,500 people
- CDPs if at least 5,000 people (except New England)
- Some CDPs if at least 1,000 people—this lower threshold applied if an incorporated place of at least 25,000 inhabitants could join with contiguous places of any size (and a density of at least 1,000 people per square mile) to reach a total population of at least 50,000.
Other features
Introduction of extended cities
Number of UAs
A total of 275
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| 1980 |
Central place requirement
Incorporated place (any size) within a densely settled area of at least 50,000 population
Method of boundary delineation
Blocks, small EDs in certain situations
Density requirement
At least 1,000 people per square mile
Place population in urban fringe
Incorporated places of at least 2,500 people
Other features
- Whole-town CDPs (MCDs in New England, Michigan, New Jersey, New York, Pennsylvania, and Wisconsin having at least 95 percent of their population and at least 80 percent of their land area qualifying for inclusion in the UA were included in their entirety in the UA—applicable only to the 1980 census).
- First CDPs in New England UAs
Number of UAs
A total of 366
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| 1990 |
Central place requirement
Incorporated place of any size within a densely settled area of at least 50,000 population; CDP of any size permitted as central place
Method of boundary delineation
Blocks exclusively
Density requirement
At least 1,000 people per square mile
Place population in urban fringe
Whole place test, minimum CDP population of generally 2,500
Other features
Intercensal UAs, new titling provisions for UAs
Number of UAs
A total of 405
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Urban and Rural Classifications12-5
