A UA comprises one or more places ("central place") and the adjacent
densely settled surrounding territory ("urban fringe") that
together have a minimum of 50,000 persons. The urban fringegenerally consists of contiguous territory having a density of at
least 1,000 persons per square mile. The urban fringe also
includes outlying territory of such density if it was connected
to the core of the contiguous area by road and is within 1 1/2
road miles of that core, or within 5 road miles of the core but
separated by water or other undevelopable territory. Other
territory with a population density of fewer than 1,000 people
per square mile is included in the urban fringe if it eliminates
an enclave or closes an indentation in the boundary of the
urbanized area. The population density is determined by (1)
outside of a place, one or more contiguous census blocks with a
population density of at least 1,000 persons per square mile or
(2) inclusion of a place containing census blocks that have at
least 50 percent of the population of the place and a density of
at least 1,000 persons per square mile.
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