| Prob. Risk |
Area (sq. mi.) |
Area Pop. |
Some Larger Population Centers in Risk Area |
| 15 % |
141,870 |
26,741,304 |
Indianapolis, IN...Columbus, OH...Cleveland, OH...St. Louis, MO...Pittsburgh, PA... |
| 5 % |
542,810 |
58,926,320 |
Chicago, IL...Detroit, MI...Milwaukee, WI...Denver, CO...Portland, OR... |
|