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CURRENT POPULATION REPORTS FEDERAL-STATE COOPERATIVE PROGRAM FOR p lati n stirn t s l1. 8, /j)f3P~R:rME~:r Of OOMMEROE • Social anti Economic Statistics Atlministration • BURE.lXU OF THE DENSUS , Series P-25, No. 597 Issued May 1975 IMATES OF THE POPULATION OF WASHINGTON UNTIES AND M ROPOLITAN A AS: JULY 1,1 3 AN 1974 This report presents population estimates for July 1, method, see Current Population Reports, Series P-26, 1973 and provisional esti mates for July 1, 1974 for No. 21, "Federal-State Cooperative Program for Local counties and metropolitan areas in Washi ngton. These Population Estimates: Test Results-April 1, 1970," esti mates were prepared by the Bureau of the Census as April 1973. Results of a test of the Administrative part of its continuing population esti mates program. Record 5 method are presented in Current Population They are consistent in methodological approach with Reports, Series P-25, No. 592.1 county estimates for other States jointly prepared by State agencies and the Bureau of the Census undel- the The esti mates shown for July 1, 1973, are based on auspices of the Federal-State Cooperative Program and an average of the following methods, adjusted to agree published in Current Population Reports, Series P-26. with the July 1, 1973 State estimate published in Series P-25, No. 533. County estimates for July 1, 1971, July 1, 1972, and provisional estimates for July 1, 1973, were pub lished earlier in Current Population Reports, Series 1. The Regression (ratio-correlation) method. In P-25, No. 517 and Series P-26, No. 66. The provisional the Regression method a multiple regression equation estimates in the last cited report are superseded by the is used to relate changes in a number of different data numbers published here. series to change in population distribution 2 The series of data used in the Regression method for Washington This report introduces an additional estimating are: automobile registrations (Xl), voter registrations procedure using administrative records, made possible by the availability of a new data source. Because of the (X 2 ), and elementary school enrollment in grades 1 resultant change in weighting of methods and changes in input data in other methods used, estimates shown here may not always be compal-able with those for the 1 Results of earlier studies were given in "Use of Admin earl ier years. istrative Records for Small-Area Population Estimates," by Meyer Zitter and David L. Word; a paper presented at the Annual Meeting of Population Association of America, New The methods used have been tested against the 1970 Orleans, Louisiana, April 27, 1974. A copy of this paper can be census and recent special censuses. A decision on obtained by writing Chief, Population Division, Bureau of the current methodology was made by the Bureau of the Census, Washington, D.C. 20233. Census on the basis of the tests. For a more detailed 2 Descriptions of methodologies are given in Current description of the Federal-State Cooperative Program Population Reports, Series P-25, Nos. 427 and 520. Modifica and an analysis of 1970 test results for methods other tions made to the methodologies for the current series will be than the recently developed Administrative Records given in forthcoming reports in Series P-25. For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402, and U.S. Department of Commerce district offices. Price 30 cents. Current Population Reports issued in Series P-20, P-23, P-25, P-26, P-27, P-28 (summaries only), P-60, and P-65 ani sold as a single consolidated subscription at $56.00 per year, $14.00 additional for foreign mailing. 2 through 8 plus elementary special and elementary and 1974 esti mates based on Component Method II ungraded (X 3 ), The prediction equation for and the Regression method to the 1973 esti mates. All Washington for the 1970's is given by counties were subsequently adjusted to agree with the provisional July 1, 1974 State estimate published in Current Population Reports, Series P-25, No. 533. 1\ Y -0.0065 + 0.1848X 1 + 0.4255X 2 + 0.3971 X.3 Table 2 of this report presents estimates of the population of metropolitan areas and metropolitan counties in the State. The titles and definitions of the 2. Component Method -II. This method employs standard metropolitan statistical areas (SMSA's) are vital statistics to measure natural increase and school those currently defined by the Office of Management enroll ment to measure net migration. The esti mates and Budget, Executive Office of the President. Where made by the Census Bureau's Co mponent Method II an SMSA falls in more than one State (indicated in the are specific to the civilian population under 65. To this SMSA title) information on the other State parts of the population is added an estimate of the population 65 area can be obtained by referring to the P·26 report for and over based on Medicare statistics and an estimate the other States. of the resident military population based on station 2 strength statistics. The 1973 estimates published in this report repre sent revisions to county estimates shown in Current 3. The Administrative Records method. This newly Population Reports, Series P-25, No. 592'. They reflect developed component method uses administrative more current data on population change than were records (in this instance individual Federal income tax available at the time that the Series P-25 report was returns) to measure civilian intercounty migration and 3 prepared. The esti mates for counties, incorporated reported vital statistics to estimate natural increase. places, and other general purpose governments pub The tax returns are matched for the successive periods lished in the Series P-25 report were used as the basis to determine the number of persons whose county of for the distribution of funds under the State and Local residence changed during the estimating period. A net Fiscal Assistance Act of 1972. See that report for a migration rate based on the number of taxpayers description of methods, assumptions, and limitations changing residence is derived; this rate is then assumed of the esti mates, to apply to the total population. This estimate is made specific to the civilian population under age 65 by Corresponding estimates for other States in the pro excluding from the migration computations data re gram will be published as they become available. The lating to persons 65 years and over. These estimates are appendix table shows reports published to date for then combined with independent estimates of the States in the 1973-74 series, together with those pub population 65 and over based on Medicare statistics. lished earlier in the decade. The other components of population change-births, deaths, immigration, net movement between the The 1970 census total for the State shown on the Armed Forces and civilian population, and resident table may differslightly from the sum of the counties military population-are identical with Component because of corrections made subsequent to the release Method II (described above). of the official State figure. All county populations for 1970 reflect the most recent corrections in the census The provisional July 1, 1974 estimates were de count. Counties with corrections of more than 500 are veloped by adding the average change between 1973 I<ing and Pierce. The estimates presented in the tables have been 2See footnote 2 on page 1. 3 For a discussion of this methodology see Donald E. rounded to the nearest hundred without being adjusted Starsinic, "Development of Population Estimates for Revenue to the State total, which was independently rounded to Sharing Areas," in U.S. Bureau of the Census, Census Tract the nearest thousand. Percentages are based on un Papers, Series GE-40, No. 10; and Zitter and Word, op cit. rounded numbers. 3 Table 1. ESTIMATES OF THE POPULATION OF WASHINGTON COUNTIES: JULY 1, 1973 AND JULY 1,1974 (State estimates are shown to the nearest thousand, county estimates to the nearest hundred) Change, 1970 Components of change, July 1, to 1974 1970 to 19742 April 1, 1974 July 1, 1970 County 1973 migration (provi- (census )1 Net sional) Number Percent Births Deaths Number Percent Washington •••••••.••••• , 3,476,000 3,431,000 3,409,169 67,000 2.0 220,000 129,000 -29,000 -0.9 Adams ••• , •••••••• , •••••• 12,800 12,700 12)014 700 6,2 1)000 400 100 0.5 Asotin •••.•••••••••••••• 14,900 14,700 13,799 1,100 7.9 900 700 900 6.5 Benton .•••••••••.••••••• 70)600 68)700 67)540 3)000 4.5 4)400 2,000 600 0.9 Chelan .................. 39)800 39,300 41) 103 -1)300 -3.2 2,200 1,900 -1,600 -4.0 Clallam ••••••••••••••••• 39,700 38,400 3'1,770 4,900 14.2 2,500 1)700 4,100 11.8 Clark ••••••••••••••••••• 149,500 145,400 128,454 21,000 16.4 9,600 4.800 16,200 12.6 Columbia •••••••••.•••••• 4,500 4,600 4,439 100 1.1 200 200 100 2.1 Cowlitz" •••••••••••••••• 70,800 70)300 68, (n6 2,200 3.2 5,000 2,500 -300 -0.4 Douglas ••••••••••••••••• 19,100 18,500 16,787 2,300 13.6 900 500 1,800 10.8 Ferry ••••••.•••••..••••. 4,300 4,000 3,655 600 16.9 300 100 500 12.4 Franklin •••• " •••••••••. 26,500 26,400 25,816 700 2.7 2,100 900 -500 -1.9 Garfield ................ 2,800 3,000 2,911 -100 -2.8 200 100 -100 -3.6 Grant •••••••••••••.••••• 44,400 43,400 41,881 2,500 5.9 3)200 1,300 600 1.5 Grays Harbor •••••••••••.