Documentation to Accompany July 1, 1999 Population Estimates for Counties Source: U.S. Census Bureau Internet Release date: March 9, 2000 The U.S. Census Bureau released these population estimates to the public in March, 2000. They contain revisions of estimates from previous years and the results of special censuses and test censuses conducted by the Census Bureau. Births - Total number of live births occurring to residents of an area during the period, as reported from the Census Bureau's Federal-State Cooperative Program for Population Estimates (FSCPE) and the National Center for Health Statistics (NCHS). Census Regions and Divisions - The Census Bureau delineates two sets of sub-national areas that are formed of states. This two-tiered system of areas consists of 9 census divisions nested in 4 census regions. The Northeast region includes the New England division: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont; and the Middle Atlantic division: New Jersey, New York, and Pennsylvania. The Midwest region includes the East North Central division: Illinois, Indiana, Michigan, Ohio, and Wisconsin; and the West North Central division: Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota. The South region includes the South Atlantic division: Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, and West Virginia; the East South Central division: Alabama, Kentucky, Mississippi, and Tennessee; and the West South Central division: Arkansas, Louisiana, Oklahoma, and Texas. The West region includes the Mountain division: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming; and the Pacific division: Alaska, California, Hawaii, Oregon, and Washington. County - These population estimates are for 3,141 counties or county equivalents. County boundary changes have occurred since the 1990 census in Alaska, Maryland, Montana, and Virginia, and are documented in the geographic change notes at: http://www.census.gov/population/www/estimates/geonotes These boundary changes apply to all years appearing in these tables. Deaths - Total number of deaths occurring within the resident population of an area during the period, as reported by FSCPE and NCHS. Demographic Components of Change - The demographic components of population change consist of births, deaths, net domestic migration, and net international migration. FIPS State/County Code - Federal Information Processing Standards (FIPS) codes uniquely identify each area. States are identified by a two digit code, counties are identified by a three digit code. FIPS codes are issued by the National Institute of Standards and Technology (NIST) of the U.S. Department of Commerce. Group Quarters Population - The group quarters population includes all persons not living in households. These people live in both institutional (e.g., nursing homes, hospitals, and prisons) and noninstitutional (e.g., college dormitories, military barracks, and workers' dormitories) settings. Natural Increase - consists of births minus deaths in an area. It can be either positive (births outnumber deaths) or negative (deaths outnumber births). Net Domestic Migration - is the difference between domestic in-migration to an area and domestic out-migration from it during the period. Domestic in-migration and out-migration consist of moves where both the origins and destinations are within the United States (excluding Puerto Rico). Net Federal Movement - is the difference between the movement of federal employees (both military and civilian) and their dependents into and out of the United States (excluding Puerto Rico) during the period. Net International Migration - is the difference between migration to an area from outside the United States (immigration) and migration from the area to outside the United States (emigration) during the period. Net international migration includes: (1) legal immigration to the United States as reported by the Immigration and Naturalization Service, (2) an estimate of net undocumented immigration from abroad, (3) an estimate of emigration from the United States, and (4) net movement between Puerto Rico and the (balance of) the United States. Numeric Population Change - the difference between the population of an area at the beginning and end of a time period. Percent Population Change - the difference between the population of an area at the beginning and end of a time period, expressed as a percentage of the beginning population. Population Estimate - The estimated population is the computed number of people living in an area (resident population) as of July 1. The estimated population is calculated from a demographic components of change model that incorporates information on natural change (births and deaths) and net migration (net domestic migration and net movement from abroad) occurring in the area since the reference date of the 1990 Census. More information on the methods used to produce these population estimates is contained in Current Population Reports P25-1127 and on our internet site at http://www.census.gov/population/www/methodep.html. Rate of Natural Increase - is births minus deaths in an area for a given time period, expressed as a percentage of the area's initial population. Rate of Net Domestic Migration - is the net domestic migration in an area over a given time period, expressed as a percentage of the area's initial population. Rate of Net International Migration - is the net international migration in an area over a given time period, expressed as a percentage of the area's initial population. Resident Population - The resident population of a state includes all residents (both civilian and armed forces) living in the state. The geographic universe for the resident population is the 50 states and the District of Columbia. It excludes Puerto Rico and the Island Areas under United States jurisdiction. The resident population excludes United States citizens residing abroad. Residual - The subnational population estimates must sum to an independently derived estimate of the national population. The residual is the difference between an area's population as estimated by the subnational population estimation procedure before and after imposing this constraint. The residual is not a demographic component of population change; rather, it is a statistical artifact of the procedures employed in producing the estimates. The residual is only shown in table CO-99-8. More information on the methods used to produce these population estimates is contained in Current Population Reports P25-1127 and on our internet site at http://www.census.gov/population/www/methodep.html. Revised 4/1/90 Population Estimate Base - is an estimate of the 1990 population for governmental units with boundaries reported as legally effective as of January 1, 1998. This includes annexations, new incorporations, mergers, et cetera.