DOI: 10.3886/icpsr09951.v1
title: Census of Population and Housing, 1990 [United States]: Public Use Microdata Sample: 1-Percent Sample
title: Version 1

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: 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: Census of Population and Housing, 1990 [United States] Series
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.
description: All persons and housing units in the United States.
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).