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Table 1 Categorisation of Counties by Rural-Urban Continuum*

From: A multilevel model for cardiovascular disease prevalence in the US and its application to micro area prevalence estimates

Code Description Metropolitan Type
1 Counties in metro areas of 1 million population or more Metropolitan
2 Counties in metro areas of 250,000 to 1 million Metropolitan
3 Counties in metro areas of fewer than 250,000 Metropolitan
4 Urban population of 20,000 or more, adjacent to a metropolitan area Non-metro
5 Urban population of 20,000 or more, not adjacent to a metropolitan area Non-metro
6 Urban population of 2,500 to 19,999, adjacent to a metropolitan area Non-metro
7 Urban population of 2,500 to 19,999, not adjacent to a metropolitan area Non-metro
8 Completely rural or less than 2,500 urban population, adjacent to a metropolitan area Non-metro
9 Completely rural or less than 2,500 urban population, not adjacent to a metropolitan area Non-metro
  1. * see http://www.ers.usda.gov/Briefing/Rurality/RuralUrbCon/