| FIPS | State + County FIPS code | 2-digit State + 3-digit County FIPS code (Federal Information Processing Standard). See also U.S. Census Bureau State & County QuickFacts. | |
| STATE | State | Two-letter state abbreviation. | |
| STATE_FIPS | State FIPS | State FIPS code (2-digit) | |
| MSA5 | Metropolitan Statistical Area 5-digit Code | Metropolitan statistical area code (5-digit code as of 2005) - defines county(ies) containing a main city or urbanized area (list) | |
| MSA5DIV | Metropolitan Statistical Area Division | Metropolitan statistical area division code (corresponds to 5-digit MSA codes) (list) | |
| Reg4_nam | Region name | Region name (4 groups) | |
| Reg4_num | Region number (4 cat) | Region number (4 groups) | |
| Reg_num | Region number (9 cat) | Region number for 9-category US Census regions | |