Table 1.
Rural–urban continuum codes—definitions and distributions.
| RUCC | Definition | US counties n = 3142 | US population n = 281,422,000 | Sample counties n = 654 | Sample persons n = 11,008,057 |
|---|---|---|---|---|---|
| 1 | >1 million, metro area | 414 (13.2%) | 149,224,000 (53.0%) | 85 (13.0%) | 6,044,182 (54.9%) |
| 2 | 250,000 to 1 million, metro area | 325 (10.3%) | 55,514,000 (19.7%) | 83 (12.7%) | 2,408,260 (21.9%) |
| 3 | <250,000, metro area | 351 (11.2%) | 27,842,000 (9.9%) | 73 (11.2%) | 1,097,909 (10.0%) |
| 4 | ≥20,000, adjacent to metro area | 218 (6.9%) | 14,442,000 (5.1%) | 43 (6.6%) | 348,967 (3.2%) |
| 5 | ≥20,000, not adjacent to metro area | 105 (3.3%) | 5,573,000 (2.0%) | 24 (3.7%) | 225,258 (2.1%) |
| 6 | 2500 to 19,999, adjacent to metro area | 609 (19.4%) | 15,134,000 (5.4%) | 128 (19.6%) | 390,697 (3.6%) |
| 7 | 2500 to 19,999, not adjacent to metro area | 450 (14.3%) | 8,464,000 (3.0%) | 112 (17.1%) | 356,686 (3.2%) |
| 8 | <2500, adjacent to metro area | 235 (7.5%) | 2,426,000 (0.9%) | 42 (6.4%) | 46,548 (0.4%) |
| 9 | <2500, not adjacent to metro area | 435 (13.8%) | 2,803,000 (1.0%) | 64 (9.8%) | 67,947 (0.6%) |
21,603 persons in the sample were missing county information.