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<br />Urban lIIId rural residanc8,-According to the defini.
<br />tion adopted for use in the 1970 census, the urban
<br />population comprises all persons living in urbanized
<br />areas and in places of 2,500 inhabitants or more
<br />outside urbanized areas. More specifically, the urban
<br />population consists of all persons living in (a) places
<br />of 2,500 inhabitants or more incorporated as cities,
<br />villages, boroughs (except in Alaska), and towns
<br />(except in the New England States, New York, and
<br />Wisconsin), but excluding those persons living in the
<br />rural portion. of extended cities (see "Urbanized
<br />areas," below); (b) unincorporated places of 2,500
<br />inhabitants or more; and (c) other territory, incorpo-
<br />rated or unincorporated, included in urbanized areas.
<br />The pOpulation not classified as urban constitutes the
<br />rural population.
<br />
<br />Urbanized areas.-An urbanized area generally
<br />contains at least one city of 50,000 inhabitants or
<br />more and includes that portion of the surrounding
<br />territory, whether incorporated or unincorporated,
<br />which meets specified criteria relating to population
<br />density. There are a few urbanized areas which are
<br />based on "twin central cities" that have a combined
<br />population of at least 50,000. Some urbanized areas
<br />contain one or more incorporated places designated
<br />as "extended cities." These places are so designated
<br />because they have Dna or more large portions
<br />(normally at the boundary of the city) with relatively
<br />low population density. These portions are classified
<br />as rural and the residents are not included in tha
<br />population of the urbanized area,
<br />
<br />County subdivisions,- The Census Bureau presents
<br />statistics for subdivisions of counties, as follows:
<br />
<br />(a) By minor civil divisions in 28 States-Arkansas,
<br />Connecticut, Illinois, Indiana, Iowa, Kansas,
<br />Louisiana, Maine, Maryland, Massachusetts,
<br />Michigan, Minnesota, Mississippi, Missouri,
<br />Nebraska, Nevada, New Hampshire, New Jersey,
<br />New York, North Carolina, Ohio, Pennsylvania,
<br />Rhode Island, South Dakota, Vermont, Virginia,
<br />West Virginia, and Wisconsin.
<br />
<br />(b) 8y census county divisions in 21 Stetes-
<br />Alabama, Arizona, California, Colorado, Dela-
<br />ware, Florida, Georgia, Hawaii, Idaho, Kentucky,
<br />Montana, New Mexico, North Dakota, Okla-
<br />homa, Oregon, South Carolina, Tennessee, Texas,
<br />Utah, Washington, and Wyoming.
<br />
<br />(c) I n Alaska, by boroughs and reservations tbr those
<br />census divisions (the county equivalent) which
<br />are so subdivided.
<br />
<br />Minor civil divisions (townships, districts, etc.! are the
<br />primary political divisions into which counties are
<br />
<br />subdivided. I n some States, incorporated places are
<br />minor civil divisions in their own right, In other
<br />States they are subordinate to the minor civil division
<br />in which they ere located, or the pattern is mixed-
<br />some incorporated places are independent minor civil
<br />divisions and others are subordinate to the minor civil
<br />division.
<br />
<br />Census county divisions represent communit"y areas
<br />which have been defined in recent decades by the
<br />Census Bureau with the cooperation of the Governors
<br />and State and local officials. These areas heve
<br />physical features (roads, streams, etc.) as boundaries
<br />or follow the limits of incorporated places. The
<br />census county divisions in these States have replaced
<br />a variety of minor civil divisions which were unsatis-
<br />factory for statistical purposes principally because
<br />their boundaries frequently changed, were imaginary
<br />lines, or were not well known by many of the
<br />inhabitants.
<br />
<br />Incorporated places.-Political units recognized as
<br />incorporated places in the reports of the census are
<br />those which are incorporated as cities, boroughs,
<br />towns, and villages, with the following exceptions: (a)
<br />boroughs in Alaska, and (b) towns in the New
<br />England Stetes, New York, and Wisconsin. For_
<br />extended cities (see "Urbanized areas" ebove), the
<br />data in table 2 refer to all of the population residing
<br />within the corporate limits of the city. For these
<br />cities, table 3 shows the urban end rural parts
<br />separately; comparable 1960 deta are not available
<br />because this concept was not used prior to 1970.
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<br />Unincorporatad p1ac8S,-As in the 1950 and 1960
<br />censuses, the Bureau has delineated boundaries for
<br />closely settled population centers without corporate
<br />limits. All such places of 1,000 inhabitants or more
<br />are shown in tables 2 and 3, and are identified with
<br />the letter "U."
<br />
<br />Boundary changes,- The boundaries of some of the
<br />areas shown in this report may have changed between
<br />1960 and 1970. The 1960 figures given here have
<br />generally not been adjusted for such changes. Specific
<br />information on the changes will be presented in the
<br />Series PC(1)-A final report for this State.
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<br />Percents end symbols,-Percents which round to less
<br />than 0.1 are shown as zero. A dash "-" signifies zero.
<br />Three dots ....." mean not applicable. Minus sign
<br />preceding a figure denotes decrease, The symbol-
<br />"NA" means not available, and "U" means that the
<br />place is unincorporated. In table 3, an asterisk"."
<br />denotes an incorporated place under 2,500 located in
<br />an urbanized area,
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<br />For Sa/II by the Burt/au of ths Census IITId U.S. DfJpBrtfTl8nr of CommtrCfJ Field OffiOflS. 26 CfI/lt&
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