Title: Resident Population in Jefferson County, CO Series ID: COJEFF9POP Source: U.S. Census Bureau Release: Annual Estimates of the Population for Counties (Not a Press Release) Seasonal Adjustment: Not Seasonally Adjusted Frequency: Annual Units: Thousands of Persons Date Range: 1970-01-01 to 2023-01-01 Last Updated: 2024-03-14 1:57 PM CDT Notes: Data for "Resident Population" are estimates as of July 1. Data for 1970, 1980, 1990, and 2000 are annual census. Population estimates are updated annually using current data on births, deaths, and migration to calculate population change since the most recent decennial census. The annual time series of estimates begins with the most recent decennial census data and extends to the vintage year. Each vintage of estimates includes all years since the most recent decennial census. DATE VALUE 1970-01-01 235.368 1971-01-01 249.200 1972-01-01 266.600 1973-01-01 284.800 1974-01-01 296.800 1975-01-01 315.300 1976-01-01 327.800 1977-01-01 339.700 1978-01-01 355.200 1979-01-01 369.500 1980-01-01 371.753 1981-01-01 384.689 1982-01-01 393.547 1983-01-01 403.358 1984-01-01 411.993 1985-01-01 418.414 1986-01-01 423.772 1987-01-01 428.666 1988-01-01 431.553 1989-01-01 435.904 1990-01-01 440.014 1991-01-01 447.371 1992-01-01 457.595 1993-01-01 472.208 1994-01-01 483.064 1995-01-01 492.154 1996-01-01 499.819 1997-01-01 507.371 1998-01-01 513.706 1999-01-01 523.325 2000-01-01 526.562 2001-01-01 529.768 2002-01-01 529.382 2003-01-01 526.946 2004-01-01 523.228 2005-01-01 522.327 2006-01-01 524.722 2007-01-01 528.743 2008-01-01 533.559 2009-01-01 537.215 2010-01-01 535.567 2011-01-01 540.582 2012-01-01 546.736 2013-01-01 552.242 2014-01-01 559.099 2015-01-01 565.240 2016-01-01 571.823 2017-01-01 576.041 2018-01-01 580.027 2019-01-01 582.800 2020-01-01 583.081 2021-01-01 580.703 2022-01-01 575.811 2023-01-01 576.366