| Statistic | Reportedincidents | /100k people | Onslow/100k people | Iowa/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | 2,139 (estimate) | 1,540 | 2,119 |
| Murder | n/a | n/a | n/a | 2.1 | 5.0 |
| Rape | n/a | n/a | n/a | 35.2 | 37.5 |
| Robbery | n/a | n/a | n/a | 18.7 | 60.6 |
| Assault | n/a | n/a | n/a | 187.2 | 256.1 |
| Violent crime | n/a | n/a (estimate) | 338 (estimate) | 243 | 359 |
| Burglary | n/a | n/a | n/a | 199.1 | 229.2 |
| Theft | n/a | n/a | n/a | 962.6 | 1,272.1 |
| Vehicle theft | n/a | n/a | n/a | 135.1 | 258.8 |
| Property crime | n/a | n/a (estimate) | 1,802 (estimate) | 1,297 | 1,760 |


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| Item | Onslow | Iowa | National |
| Law enforcement employees (officers & civilians) | n/a | 3,827 | 558,732 |
| Police officers & civilians /1000 residents | n/a | 1.8 | 3.3 |
| State | Total offenders | Iowa /100K | National /100K |
| Iowa | 6,040 | 205 | 266 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Cascade, IA | 2,104 | 90 | 479 | 569 |
| Anamosa, IA | 5,484 | 104 | 570 | 673 |
| Monticello, IA | 3,843 | 0 | 739 | 739 |
| Mechanicsville, IA | 983 | 0 | 1,119 | 1,119 |
| Bernard, IA | 140 | 271 | 1,449 | 1,720 |
| Stanwood, IA | 673 | 281 | 1,501 | 1,782 |
| Wyoming, IA | 452 | 293 | 1,562 | 1,855 |
| Onslow, IA | 304 | 338 | 1,802 | 2,139 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Hebron, TX | 304 | 157 | 824 | 981 |
| Belfry, MT | 304 | 555 | 2,118 | 2,673 |
| Mingo, IA | 304 | 301 | 1,608 | 1,909 |
| Trapper Creek, AK | 304 | 918 | 2,169 | 3,087 |
| Oslo, MN | 304 | 320 | 2,003 | 2,323 |
| Onslow, IA | 304 | 338 | 1,802 | 2,139 |