NATIONAL POPULATION ESTIMATES BY NATIVITY DETAILED FILE LAYOUT Source: Population Estimates Program, Population Division, U.S. Census Bureau, Washington, D.C. 20233 Internet Release date: April 11, 2000 A. Record Layout The 1990 quarterly foreign-born and native resident population estimate files have an identical layout. Each record has a total length of 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. B. Explanation of Data Fields Series: Each national population estimate record has the series designation "9P", which represents the year of production (1999) and the fact that they are postcensal estimates. Month: The reference dates for quarterly estimates coincide with the first day of the first month of the quarter. For the foreign-born and native national population estimates, the reference dates have month codes of "1", "4", "7", and "10", which represent the first day of January, April, July, and October, respectively. Year: Each year is identified by four digits, so a code of "1999" indicates the year 1999. In previous releases, year has been represented by two digits. Age: The first record for each reference date has an age code of "999", which lists the population counts for all ages combined. Each age code that follows represents a single year of age, except for "100", which lists the population counts for people 100 years of age and over (centenarians). Sex, Race and Hispanic Origin: Each record lists population counts for 21 different sex-race-Hispanic origin categories. The first category shows the total population for the listed age. 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