| Rural Urban Continuum Code |
| 1 - Metro - Counties in metro areas of 1 million population or more |
| 2 - Metro - Counties in metro areas of 250,000 to 1 million population |
| 3 - Metro - Counties in metro areas of fewer than 250,000 population |
| 4 - Nonmetro - Urban population of 20,000 or more, adjacent to a metro area |
| 5 - Nonmetro - Urban population of 20,000 or more, not adjacent to a metro area |
| 6 - Nonmetro - Urban population of 2,500 to 19,999, adjacent to a metro area |
| 7 - Nonmetro - Urban population of 2,500 to 19,999, not adjacent to a metro area |
| 8 - Nonmetro - Completely rural or less than 2,500 urban population, adjacent to a metro area |
| 9 - Nonmetro - Completely rural or less than 2,500 urban population, not adjacent to a metro area |