| Statistic | Reportedincidents | /100k people | Marietta/100k people | Illinois/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | n/a (estimate) | 2,004 | 2,119 |
| Murder | n/a | n/a | n/a | 5.8 | 5.0 |
| Rape | n/a | n/a | n/a | 46.9 | 37.5 |
| Robbery | n/a | n/a | n/a | 90.2 | 60.6 |
| Assault | n/a | n/a | n/a | 146.3 | 256.1 |
| Violent crime | n/a | n/a (estimate) | n/a (estimate) | 289 | 359 |
| Burglary | n/a | n/a | n/a | 290.5 | 229.2 |
| Theft | n/a | n/a | n/a | 1,134.4 | 1,272.1 |
| Vehicle theft | n/a | n/a | n/a | 290.4 | 258.8 |
| Property crime | n/a | n/a (estimate) | n/a (estimate) | 1,715 | 1,760 |


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| Item | Marietta | Illinois | National |
| Law enforcement employees (officers & civilians) | n/a | 30,690 | 558,732 |
| Police officers & civilians /1000 residents | n/a | 2.6 | 3.3 |
| State | Total offenders | Illinois /100K | National /100K |
| Illinois | 32,213 | 263 | 266 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Cuba, IL | 1,066 | 145 | 863 | 1,008 |
| Lewistown, IL | 2,021 | 152 | 899 | 1,051 |
| Bushnell, IL | 2,789 | 163 | 970 | 1,133 |
| Adair, IL | 179 | 333 | 1,974 | 2,306 |
| Fairview, IL | 456 | 369 | 2,187 | 2,556 |
| London Mills, IL | 326 | 383 | 2,272 | 2,655 |
| Good Hope, IL | 405 | 396 | 2,352 | 2,748 |
| Marietta, IL | 61 | n/a | n/a | n/a |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| South Gorin, MO | 61 | 747 | 3,137 | 3,883 |
| Olowalu, HI | 61 | 88 | 787 | 875 |
| Grant, IA | 61 | 350 | 1,870 | 2,220 |
| Esbon, KS | 61 | 680 | 3,032 | 3,712 |
| Cayuse, OR | 61 | 283 | 2,040 | 2,323 |
| Marietta, IL | 61 | n/a | n/a | n/a |