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<br />Standard metropolitan statistical areas,- The Bureau
<br />of the Census rt:Cogmzes approximatelY 250 standard
<br />metropolitan statistical areas (SMSA's) in the 1970
<br />census These include the 231 SMSA's (including
<br />three in Puerto Rico) as defined and named in the
<br />Bureau of the Budget publication, Stardard Metro.
<br />politan Statistical Areas: 7961. U.S. Government
<br />Printing Office, Washington, D.C. 20402. Also
<br />included are two SMSA's as defined by the Bureau of
<br />the Budget in January 196B. In addition, a number of
<br />SMSA's are being defined on the basis of the results
<br />from the 1970 census.
<br />
<br />Except in the New England States, a standard
<br />metropolitan statistical area is a countY or group of
<br />contiguous counties which contains at least one city
<br />of 50,000 inhabitants or more, or "twin cities" with a
<br />combined population of at least 50,000. I n addition
<br />to the county, or counties, containing such a city or
<br />cities, contiguous counties are included in an SMSA
<br />if, according to certain criteria, they are socially and
<br />economically integrated with a central city. In a few
<br />cities where portions of counties outside the SMSA as
<br />defined in 1967 were annexed to the central city, the
<br />population living in those counties is not considered
<br />part of the central city. In the New England States,
<br />SMSA's consist of towns and cities instead of
<br />counties. For a complete description of the criteria
<br />used in defining SMSA's, see the Bureau of the
<br />Budget publication cited above.
<br />
<br />Plac8S.- Two types of places oro recugnized in tho
<br />census reports, incorporated places and unincorpo-
<br />rated places. Incorporated places are political units
<br />incorporated as cities, boroughs, towns, and villages
<br />except for (a) boroughs in Alaska and (b) towns In
<br />the New England States, New York, and Wisconsin.
<br />Unincorporated places are closely settled population
<br />centers without corporate limits for which the Census
<br />Bureau has delineated boundaries Each place so
<br />delineated possesses a definite nucleus of residences
<br />and has its boundaries drawn to include, if feasible,
<br />all the surrounding closely settled area. Unincorpo-
<br />rated places are identified with the letter "U."
<br />
<br />Towns.-I n this series of reports, data for towns of
<br />10,000 inhabitants or more are shown in the reports
<br />for the New England States I n these States, towns
<br />are the primary political subdivision of the county,
<br />unlike most other States where towns are generally
<br />incorporated places
<br />
<br />Housing units and group quarters,-AII living querters
<br />are classified in the census as either housing units or
<br />group quarters Usuallv, living quarters are in struc-
<br />TUres intended for residential use (e.9., a one. family
<br />
<br />home, apartment house, hotel or motel, boerding
<br />house, mobile home or trailer, etc.). Livin9 quarters
<br />may also be in structures intended for nonresidential
<br />use (e.g., the rooms in a warehouse where a watch,
<br />man lives), as well as in tents, caves, old railroad cars,
<br />etc.
<br />
<br />A housing unit is a house, an apartment, a group of
<br />rooms, or a single rOOm occupied or intended for
<br />occupancy as separate living quarters. Separate living
<br />quarters are those in which the occupants do not live
<br />and eat with any other persons in the structure and
<br />which quarters have either (1) direct access from the
<br />outside of the building or through a common hell or
<br />(2) complete kitchen facilities for the exclusive use of
<br />the occupants. The occupants may be a single family,
<br />one person living alone, two or more families living
<br />together, or any other group of related or non related
<br />persons who share I iving arrangements (except as
<br />described in the next paragraph on group quarters).
<br />Both occupied and vacant housing units are included
<br />in the housing inventory, except that mobile homes,
<br />trailers, tents, etc., are included only if they are
<br />occu pied.
<br />
<br />Group quarters are living arrangements for institu-
<br />tional inmates or for other groups containing five or
<br />more persons not related to the person in charge.
<br />Group quarters are located most frequently in institu.
<br />tions, boarding houses, military barracks, collega
<br />dormitories, fraternity end sorority houses, hospitals,
<br />monasteries, convents, and ships. A house or epert.
<br />ment is considered group quarters if it is shered by
<br />the person in charge. and five or more persons
<br />unrelated to him, or if there is no person in charge,
<br />by six or more unrelated persons. I nformation on the
<br />housing characteristics of group quarters is not
<br />collected in the census.
<br />
<br />Year.round housing units.-Data on housing charac.
<br />teristics are limited to year-round hOUSing units-all
<br />occupied units plus vacant units which are Intended
<br />for year-round use-because it is difficult to obtain
<br />reliable information for the remaining types of units,
<br />i.e., units reported as vacant at the time of the census
<br />and intended for seasonal occupancy or held for
<br />migratory labor.
<br />
<br />Occupied housing units,-A housing unit is classified
<br />as occupied if a person or group of persons is living in
<br />it at the time of enumeration or if the occupants are
<br />only temporarily absent, for example, on vacation.
<br />However, if the persons staying in the unit hove their
<br />usual place of residence elsewhere, the unit is
<br />classified as vacant
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