| Statistic | Reportedincidents | /100k people | St. Mary/100k people | Missouri/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | 3,546 (estimate) | 2,554 | 2,281 |
| Murder | n/a | n/a | n/a | 9.1 | 5.7 |
| Rape | n/a | n/a | n/a | 46.4 | 38.0 |
| Robbery | n/a | n/a | n/a | 52.9 | 66.5 |
| Assault | n/a | n/a | n/a | 350.2 | 264.1 |
| Violent crime | n/a | n/a (estimate) | 637 (estimate) | 459 | 364 |
| Burglary | n/a | n/a | n/a | 251.2 | 250.7 |
| Theft | n/a | n/a | n/a | 1,365.4 | 1,347.2 |
| Vehicle theft | n/a | n/a | n/a | 478.6 | 318.7 |
| Property crime | n/a | n/a (estimate) | 2,908 (estimate) | 2,095 | 1,917 |


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| Item | St. Mary | Missouri | National |
| Law enforcement employees (officers & civilians) | n/a | 12,115 | 558,732 |
| Police officers & civilians /1000 residents | n/a | 3.7 | 3.3 |
| State | Total offenders | Missouri /100K | National /100K |
| Missouri | 19,657 | 344 | 266 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Ellis Grove, IL | 316 | 0 | 0 | 0 |
| Chester, IL | 8,264 | 74 | 443 | 517 |
| Ste. Genevieve, MO | 4,396 | 376 | 812 | 1,188 |
| Perryville, MO | 8,500 | 331 | 946 | 1,278 |
| Bloomsdale, MO | 828 | 397 | 1,813 | 2,210 |
| Ozora, MO | 109 | 415 | 1,894 | 2,309 |
| Longtown, MO | 127 | 419 | 1,914 | 2,333 |
| St. Mary, MO | 261 | 637 | 2,908 | 3,546 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Smith Island, MD | 261 | 613 | 2,980 | 3,593 |
| Long Pine, NE | 261 | 320 | 2,747 | 3,066 |
| Cherokee Pass, MO | 261 | 516 | 2,353 | 2,869 |
| Talmage, NE | 261 | 342 | 2,937 | 3,279 |
| Skyland, NV | 261 | 168 | 1,017 | 1,185 |
| St. Mary, MO | 261 | 637 | 2,908 | 3,546 |