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. Author manuscript; available in PMC: 2021 Jul 14.
Published in final edited form as: Alzheimers Dement. 2021 Mar 4;17(7):1213–1230. doi: 10.1002/alz.12285

TABLE A1.

Rurality categories of counties

RUCC 2013 Description Category
1 Metro - Counties in metro areas of 1 million population or more Metro
2 Metro - Counties in metro areas of 250,000 to 1 million population Metro
3 Metro - Counties in metro areas of fewer than 250,000 population Metro
4 Nonmetro - Urban population of 20,000 or more, adjacent to a metro area Micro
5 Nonmetro - Urban population of 20,000 or more, not adjacent to a metro area Micro
6 Nonmetro - Urban population of 2500 to 19,999, adjacent to a metro area Micro
7 Nonmetro - Urban population of 2500 to 19,999, not adjacent to a metro area Micro
8 Nonmetro - Completely rural or less than 2500 urban population, adjacent to a metro area Rural
9 Nonmetro - Completely rural or less than 2500 urban population, not adjacent to a metro area Rural

Abbreviation: RRUC, rural urban continuum code.