Census 2000 pl 94 171 techdoc
OH Ohio OK Oklahoma OR Oregon PA Pennsylvania PR Puerto Rico RI Rhode Island SC...Connecticut 21 New York 22 New Jersey 23 Pennsylvania 31 Ohio 32 Indiana 33 Illinois 34
https://www.census.gov/content/dam/Census/programs-surveys/rdo/TechnicalDocumentation/Census2000_pl94-171_techdoc.pdf