DOI: 10.3886/icpsr09951.v4
title: Census of Population and Housing, 1990 [United States]: Public Use Microdata Sample: 1-Percent Sample
title: Version 4

description: The Public Use Microdata Sample (PUMS) 1-Percent Sample
 contains household and person records for a sample of housing units
 that received the "long form" of the 1990 Census questionnaire. Data
 items include the full range of population and housing information
 collected in the 1990 Census, including 500 occupation categories, age
 by single years up to 90, and wages in dollars up to $140,000. Each
 person identified in the sample has an associated household record,
 containing information on household characteristics such as type of
household and family income.
description: A stratified sample, consisting of a subsample of the 
 household units that received the 1990 Census "long-form" 
questionnaire (approximately 15.9 percent of all housing units).
description: Datasets: 
DS0: Study-Level Files
DS1: Alabama
DS2: Alaska
DS4: Arizona
DS5: Arkansas
DS6: California
DS8: Colorado
DS9: Connecticut
DS10: Delaware
DS11: District of Columbia
DS12: Florida
DS13: Georgia
DS15: Hawaii
DS16: Idaho
DS17: Illinois
DS18: Indiana
DS19: Iowa
DS20: Kansas
DS21: Kentucky
DS22: Louisiana
DS23: Maine
DS24: Maryland
DS25: Massachusetts
DS26: Michigan
DS27: Minnesota
DS28: Mississippi
DS29: Missouri
DS30: Montana
DS31: Nebraska
DS32: Nevada
DS33: New Hampshire
DS34: New Jersey
DS35: New Mexico
DS36: New York
DS37: North Carolina
DS38: North Dakota
DS39: Ohio
DS40: Oklahoma
DS41: Oregon
DS42: Pennsylvania
DS44: Rhode Island
DS45: South Carolina
DS46: South Dakota
DS47: Tennessee
DS48: Texas
DS49: Utah
DS50: Vermont
DS51: Virginia
DS53: Washington
DS54: West Virginia
DS55: Wisconsin
DS56: Wyoming
DS72: Puerto Rico
DS84: Geographic Equivalency File for the Entire Nation
DS86: Ancestry Code List
DS87: Place of Birth Code List
DS88: Industry Code List
DS89: Language Code List
DS90: Occupation Code List
DS91: Race Code List
DS99: Public Use Microdata Areas (PUMAS) Crossing State Lines
description: All persons and housing units in the United States.
description: (1) Although all records are 231 characters in length,
 each file is hierarchical in structure, containing a housing unit
 record followed by a variable number of person records. Both record
 types contain approximately 120 variables. Two improvements over the
 1980 PUMS files have been incorporated. First, the housing unit serial
 number is identified on both the housing unit record and on the person
 record, allowing the file to be processed as a rectangular file. In
 addition, each person record is assigned an individual weight,
 allowing users to more closely approximate published reports. Unlike
 previous years, the 1990 PUMS 1-Percent and 5-Percent Samples have not
 been released in separate geographic series (known as "A," "B,"
 etc. records). Instead, each sample has its own set of geographies,
 known as "Public Use Microdata Areas" (PUMAs), established by the
 Census Bureau with assistance from each State Data Center. The PUMAs
 in the 1-Percent Sample are based on a distinction between
 metropolitan and nonmetropolitan areas. Metropolitan areas encompass
 whole central cities, Primary Metropolitan Statistical Areas (PMSAs),
 Metropolitan Statistical Areas (MSAs), or groups thereof, except where
 the city or metropolitan area contains more than 200,000
 inhabitants. In that case, the city or metropolitan area is divided
 into several PUMAs. Nonmetropolitan PUMAs are based on areas or groups
 of areas outside the central city, PMSA, or MSA. PUMAs in this
 1-Percent Sample may cross state lines. (2) The codebook is provided
 as a Portable Document Format (PDF) file. The PDF file format was
 developed by Adobe Systems Incorporated and can be accessed using PDF
 reader software, such as the Adobe Acrobat Reader. Information on how
 to obtain a copy of the Acrobat Reader is provided through the ICPSR
Website on the Internet.