U.S. Population Estimates by Age, Sex, Race, and Hispanic Origin: 1980 to 1999 (With short-term projection to dates in 2000) Source: Population Estimates Program, Population Division, U.S. Census Bureau Internet Release Date: April 11, 2000 The 1990 monthly postcensal national population estimate data files have an identical layout. All records contain 222 characters. All data fields are right-justified. Location Type Data 1-2 Character Series 3-4 Numeric Month 5-8 Numeric Year 9-11 Numeric Age (years) 12 (blank) (blank) 13-22 Numeric Total population 23-32 Numeric Total male population 33-42 Numeric Total female population 43-52 Numeric White male population 53-62 Numeric White female population 63-72 Numeric Black male population 73-82 Numeric Black female population 83-92 Numeric American Indian, Eskimo, and Aleut male population 93-102 Numeric American Indian, Eskimo, and Aleut female population 103-112 Numeric Asian and Pacific Islander male population 113-122 Numeric Asian and Pacific Islander female population 123-132 Numeric Hispanic male population 133-142 Numeric Hispanic female population 143-152 Numeric White, non-Hispanic male population 153-162 Numeric White, non-Hispanic female population 163-172 Numeric Black, non-Hispanic male population 173-182 Numeric Black, non-Hispanic female population 183-192 Numeric American Indian, Eskimo, and Aleut, non-Hispanic male population 193-202 Numeric American Indian, Eskimo, and Aleut, non-Hispanic female population 203-212 Numeric Asian and Pacific Islander, non- Hispanic male population 213-222 Numeric Asian and Pacific Islander, non- Hispanic female population Within each file, the records are first sorted by the reference date (Month-Year) in chronological order. For each reference date, the first record lists the population counts for all ages combined. The remaining records list the population counts by single year of age in ascending order. Explanation of Data Fields (ASCII Files) Series: Quarterly estimates for April 1, 1980, to April 1, 1990 have a series designation of "2I", representing the year of production (1992) and the fact that they are intercensal estimates. Monthly estimates for April 1, 1990 and onward have a series designation "8P", representing the year of production (1998) and the fact that they are postcensal estimates. Month: Monthly estimates for April 1, 1990 and onward designate the months numerically. A "1" indicates population data for January 1; a "2" indicates population data for February 1; and so on. Quarterly estimates for April 1, 1980, to April 1, 1990 designate the first month of each quarter numerically. The monthly reference dates are "1", "4", "7", and "10", for the first day of January, April, July, and October, respectively. Year: In post-1990 monthly files, year is identified by four digits. For example, a code of "99" indicates the year 1999. In previous releases, year has been represented by the last two digits. In the quarterly files for the 1980s, year continues to be represented by two digits. Age group: The total population code is 999, which is the first record for each year. This is followed by 0 to 99, which are individual ages, and 100, which is the population 100 years of age and over (centenarians). Sex, race and Hispanic origin: Population data are shown for a total of 21 categories. The first category shows the total population of the age group. The remaining 20 categories list the male and female populations, respectively, for the following racial and/or Hispanic origin categories: Total (All races) White Black American Indian, Eskimo, and Aleut Asian and Pacific Islander Hispanic origin (of any race) Non-Hispanic White Non-Hispanic Black Non-Hispanic American Indian, Eskimo, and Aleut Non-Hispanic Asian and Pacific Islander.