Subcounty Resident Population Estimates // Source: U.S. Census Bureau, Population Division // Note: The estimates are based on the 2010 Census and reflect changes to the April 1, 2010 population due to the Count Question Resolution program and geographic program revisions. See Geographic Terms and Definitions at http://www.census.gov/popest/about/geo/terms.html for a list of the states that are included in each region and division. For functional status codes, see http://www.census.gov/geo/reference/codes/place.html. All geographic boundaries for these population estimates are as of current vintage year. An (X) in the 2010 Census field indicates a government that was formed or incorporated after the 2010 Census. See additional information on these areas in the Geographic Boundary Change Notes (http://www.census.gov/geo/reference/boundary-changes.html). For population estimates methodology statements, see http://www.census.gov/popest/methodology/index.html. // The estimates base populations for the unincorporated part of Gadsden County, FL and Rockwell City city, IA (located in Calhoun County) include different group quarters population than enumerated in the 2010 Census. After comparison with other Census Bureau data collection efforts, the Census Bureau determined that the 2010 Census enumeration of the group quarters population in these areas was incomplete. Although not eligible for the Count Question Resolution program, the Census Bureau concluded that including the additional group quarters population for these two areas into the population estimates base would provide more accurate estimates for each area. // Each year, the Census Bureau's Population Estimates Program (PEP) utilizes current data on births, deaths, and migration to calculate population change since the most recent decennial census, and produces a time series of estimates of population. The annual time series of estimates begins with the most recent decennial census data and extends to the vintage year. The vintage year (e.g., V2014) refers to the final year of the time series. The reference date for all estimates is July 1, unless otherwise specified. With each new issue of estimates, the Census Bureau revises estimates for years back to the last census. As each vintage of estimates includes all years since the most recent decennial census, the latest vintage of data available supersedes all previously produced estimates for those dates. The Population Estimates Program provides additional information including historical and intercensal estimates, evaluation estimates, demographic analysis, and research papers on its website: http://www.census.gov/popest/index.html.