| Statistic | Rock City | Illinois | National |
| Population | 354 | 12,671,821 | 328,239,523 |
| Population density (sq mi) | 2,638 | 228 | 91 |
| Median age | 35.5 | 37.4 | 37.7 |
| Male/Female ratio | 0.9:1 | 1.0:1 | 1.0:1 |
| Married (15yrs & older) | 62% | 55% | 55% |
| Families w/ Kids under 18 | 47% | 44% | 43% |
| Speak English | 99% | 77% | 79% |
| Speak Spanish | 1% | 13% | 13% |
| Race | Rock City | Illinois | National |
| White | 91.81% | 72.14% | 73.35% |
| Black | 0.00% | 14.30% | 12.63% |
| Asian | 0.00% | 5.10% | 5.22% |
| American Indian | 6.78% | 0.23% | 0.82% |
| Native Hawaiian | 0.00% | 0.03% | 0.18% |
| Mixed race | 1.41% | 2.34% | 3.06% |
| Other race | 0.00% | 5.86% | 4.75% |
Here are the best places to live in Illinois
These are the 10 cheapest cities in Illinois
Check out the 10 most dangerous cities in Illinois
Check out the 10 safest cities in Illinois