| Population group | Number of participating agencies |
Population covered |
|---|---|---|
| Total | 13,690 | 269,382,053 |
| Group I (Cities 250,000 and over) |
71 | 53,812,759 |
| Group II (Cities 100,000 - 249,999) |
187 | 27,423,972 |
| Group III (Cities 50,000 - 99,999) |
438 | 29,876,861 |
| Group IV (Cities 25,000 - 49,999) |
764 | 26,228,269 |
| Group V (Cities 10,000 - 24,999) |
1,620 | 25,747,291 |
| Group VI1 (Cities under 10,000) |
7,047 | 21,815,618 |
| Metropolitan Counties1 | 1,418 | 60,829,830 |
| Nonmetropolitan Counties1 | 2,145 | 23,647,453 |