Table 1.

Overview of Rural–Urban Continuum Categories.

Category and Defintion	Number of Counties	Total Population	Proportion of Population by RUCC	Average County Population
1. Metrocounties in metro areas of 1 million	432	182,406,377	55.7 a	422,237 b
2. Metrocounties in metro areas of 250,000 to 1 million population	376	69,758,436	21.3	185,528
3. Metrocounties in metro areas of fewer than 250,000 population	354	29,518,397	9.0	83,385
4. Nonmetro‐Urban population of 20,000 or more, adjacent to a metro area	214	13,620,408	4.2	63,647
5. Nonmetro‐Urban population of 20,000 or more, not adjacent to metro area	91	5,008,469	1.5	55,038
6. Nonmetro‐Urban population of 2,500 to 19,999, not adjacent to a metro area	593	14,634,916	4.5	24,679
7. Nonmetro‐Urban population of 2,500 to 19,999, not adjacent to a metro arear	425	7,954,349	2.4	18,716
8. Nonmetro‐Completely rural or less than 2,500 urban population, adjacent to metro area	219	2,118,659	0.6	9,674
9. Nonmetro‐Completely rural or less than 2,500 urban population, not adjacent to metro area	408	2,487,881	0.8	6,098
Total	3,112	327,507,892	100.0	105,240

^a Percent of Total U.S. residents in each RUCC category.

^b Computed by dividng total population in RUCC category by number of counties in category.