Estimates of the Population of Counties by Age, Sex, Race, and Hispanic Origin [United States]: 1990-1996 United States Department of Commerce. Bureau of the Census counties population characteristics population estimates ICPSR.I.A.4 These data are estimates of the resident population of the counties in the United States. Part 1 provides county population estimates by five-year age category (ages 0-4, 5-9, etc.), sex, and modified race/Hispanic origin. Data in Part 2 are presented by single-year age (under 1 year, 1 year, ..., 84 years, 85 years and over) and sex. Part 3 contains estimates of the state total and the counties of each state by modified race and Hispanic origin. The estimates are for July 1st of each year during 1990-1996. 2011-08-15 aggregate data 2372 10.3886/ICPSR02372.v2 (1) The April 1, 1990, modified census counts for counties, (2) extracts of detailed individual-record data on births and deaths from the National Center for Health Statistics (NCHS), (3) annual extract of tax returns provided by the Internal Revenue Service (IRS), (4) a 20-percent sample of information on the Social Security Administration Application File for internal migration, and (5) immigration data from the Immigration and Naturalization Service United States 1990--1996 ICPSR metadata records are licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License (http://creativecommons.org/licenses/by-nc/3.0/us/).