ESTIMATES of the POPULATION of COUNTIES I JULY 1, 1966* (Report No.1)
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Series P-25, No. 401 August 28, 1968 ESTIMATES OF THE POPULATION OF COUNTIES I JULY 1, 1966* (Report No.1) (Estimates shown here are generally ()onsistent with those published for metropolitan counties July 1, 1965, shown in Current Population Reports, Series P-25, Nos. 371 and 378. They supersede the provisional metropolitan county estimateEl for July 1, 1966, sho~ in report No. 378) This report presents estimates of the population METHODOLOGY for Jiliy 11, 1966, for 940 counties in 20 selected States. This is the first of three reports showing Three methods are employed by the Bureau of population estimates for all the counties in the the Census in developing current county estimates. United States for July 1, 1966. These estimates They are (1) the Bureau's Component 'Method II, relate to the total resident population in each which employs vital statistics to measure natural county; that is, the civilian resident population increase and school enrollment (or school census) ;Jlus members of the Armed Forces stationed in data as a basis for measuring net migration; (2) the area. a composite method, in which separate estimates are prepared for different segments of the popula The States covered in this report are: Arkansas, tion using different types of current data for each California, Connecticut, Delaware, Florida, Idaho, group; and (3) a housing unit method, in which esti Louisiana, Maine, Maryland, Massachusetts, Min mated changes in the number of occupied housing nesota, New Hampshire, New Jersey, North Caro units are used as the basis for estimating Changes lina, Oklahoma, Pennsylyania, Rhode Island, in population. Vermont, Virginia, and West Virginia. Estimates are shown for J ul y 1, 1966, for each county in these States, together with the components of The methodology used in developing current population change (births, deaths, and net migration) estimates by these three methods is discussed in for the period since April 1, 1960. Summaries Current Population Reports, Series P-25, No. 371. for each State are also shown for metropolitan and A detailed step-by-step outline of Component nonmetropolitan counties. Method II is presented in Series P-25, No. 339. * These estimates were prepared in the .State and Local Population Estimates and Projections Branch, Population DiviSion, in connection with a contractual arrangement to provide data for metropolitan areas and counties to the following Federal agencies: the Office of Civil Defense, the Economic Development Administration (Department of Commerce), the Office of Transportation Information Planning (Department of Transportation), and the Defense Communic,ations Agency (Department of Defense). For sale by the Superintendent of Documents, U.S. Government Printing Ojfice, Washington, D.C. 20402,15 cents. Annual subscriptiMt (Series P-20, P-23, P-25, P-27, P-28 summaries, P-60, and P-65, combined), $5 .. 00; foreign mailing, $6.50. "FOr'tfi'is repo'r't, all three methods were employed counties indicated as metropolitan are whole-county in developing estimates for metropolitan counties approximations to the SMSA's. Adetailedexplana::' ,~.11,i1UJ3tatE:s and for th,~ nonl1!E:t}:QPolitan c()Unti~s in c tion of the criteria used in establishing SMSA's is California, Maryland, New Jersey, Rhode Island, given in Standard Metropolitan Statistical Areas, and Virginia.1 For all remaining counties, esti Executive Office of the President, Bureau 01' the mates were developed by Component Method II and Budget, 1967. the Composite method only. The results of the two or three methods were then averaged. ROUNDING OF ESTIMATES As a final step, the average estimates for the Estimates presented in the tables contained in counties in each State were summed and adjusted this report have been rounded to the nearest hundred to an independent State total published in Current for counties and to the nearest thousand for States PORulation Reports, Seri.es P-25, No. 380. Addi without being adjusted to group totals, which are tional adjustments were made as needed in special independently rounded. Percentages are based on population groups, such as college and institutional unrounded numbers. popUlations, since the regular estimating method ology would not be expected to reflect fully any FEDERAL-STATE COOPERATIVE PROGRAM large or unusual changes in these groups. FOR LOCAL POPULATION ESTIMATES Special estimates for selected areas.--For a The estimates presented in this report are a number! of areas, additional data are available for "one-time" set of estimates prepared by the Bureau use. in:, the preparation of population estimates. of the Census as a by-product of a larger project Such sources as special censuses conducted by the now under way for a number of Federal agencies. Bureau of the Census since 1960 and censuses Preparation of corresponding annual postcensal conducted by State or county governments have estimates for all the counties in the country is not been drawn upon. Counties where estimates have now part of the Census Bureau's program. In been prepared using these special data sources recognition of the widespread need for. small-area are fqotnoted in the table. Areas particularly population estimates of uniform quality from State affected are Delaware, Rhode Island, and 21 to State, the Bureau of the Census has been counties in North Carolina, which had special developing a cooperative program with the States censuses conducted by the Census Bureau, and for the preparation and publication of county Massachusetts, which had a State-conducted census. population 'estimates. The ultimate objective of the cooperative program is the development and LIMIT ATIONS publication of State-prepared county population figures, by preferred methods, largely standardized A detailed discussion of the limitations of the for data input and methods mutually agreed upon by various methods used in the preparation of metro the States and the Bureau of the Census. politan county estimates and of the relationship of estimates prepared by each method to the pub The selection of methods will be made on the lished average of methods is contained in report basis of a large-scale test and evaluation program No. 371. A large proportion of the counties for to be carried out when the 1970 Census results which estimates are presented in this report, how become available. To date (as of July 1, 1968) ever, had a population under 20,000. Theestimates 39 States have agreed to participate in the program, for these smaller areas may not have as high a working with the Census Bureau to achieve the level of accuracy, on the average, as those for large goals described above. A listing of the States and metropolitan areas. the agencies designated by State governors to work with the Bureau of the Census on the technical DEFINITIONS aspects of the program is given in the appendix. 2 Metropolitan counties are those counties in During this past year, several States have cluded in standard metropolitan statistical areas published county population estimates in consul (SMSA's) as of June 1968. InNewEngland, however, tation with the Bureau of the Census, using method SMSA's are defined in terms of towns and cities, ology largely within the general framework of the rather than counties. Therefore the New England 2For a more detailed description of the program, . lHousing'unit estimates were developed for non see, Meyer Zitter, "Federal-State Cooperative Pro metropolitan counties where evidence indicated thai; gram for J...ocal Population Estimates," Tl;te Regisi;rar completeness of coverage of areas reporting resi and Statisticia~, U.S. Department of Health, Educa deni;ial building permits issued was very high. tion, and Welfare, January 1968. 3 goals of the Federal-State Cooperative ·Program. Leonard M. Sizer, Estimates of the Population The State-prepared county estimates are contained of West Virginia Counties, July 1,1950-1966, in the following reports: November 1967, Office of Research and Development, Center for Appalachian Studies Population Estimates of Arizona as of July 1, and Development, West Virginia University, 1967, Research and Reports Section, Un Morgantown, West Virginia. emplpyment Compensation Division, Employ ment) Security Commission of Arizona, In general, the State-prepared county population Phoepix, Arizona. figures differ only slightly from those contained in this report, and the pattern of population redistri bution since 1960 is quite similar for both sets. Forrest H. Pollard, "Preliminary Estimates Small differences in the two sets of estimates come of the Population of Louisiana Parishes: about because of differences in data input, differ July 1, 1966," The Louisiana Economy, ences in the specific methods used in arriving at Volume 1, No.1, April 1968, Division of final "average" estimates, or as is the case in Business and Economic Research, School Arizona, a difference in the total State populati.on to of Business Administration, Louisiana Poly which the county estimates were adjusted. technic Institute, Ruston, Louisiana. In later years, should the objectives of the Federal-State Cooperative Program for Local C. Horace Hamilton, Estimates of the Popu Population Estimates be realized, the Bureau of the lation of North Carolina Counties, 1966 and Census would publish State-prepared estimates 19'67, Demographic Report H-l, May 1968, similar to those published in the above-mentioned Statistical Service Center, Budget Division, reports in lieu of preparing its own estimates. In