| Statistic | Reportedincidents | /100k people | Armstrong/100k people | Iowa/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | 2,011 (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) | 317 (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) | 1,694 (estimate) | 1,297 | 1,760 |


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| Item | Armstrong | 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 |
| Graettinger, IA | 1,044 | 112 | 598 | 710 |
| Dolliver, IA | 70 | 293 | 1,563 | 1,856 |
| Gruver, IA | 56 | 304 | 1,620 | 1,924 |
| Bancroft, IA | 719 | 309 | 1,650 | 1,959 |
| Fenton, IA | 232 | 319 | 1,703 | 2,022 |
| Lone Rock, IA | 179 | 339 | 1,809 | 2,147 |
| Burt, IA | 517 | 343 | 1,831 | 2,174 |
| Armstrong, IA | 846 | 317 | 1,694 | 2,011 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Courtland, MS | 846 | 307 | 1,994 | 2,301 |
| Rosedale, IN | 846 | 358 | 1,578 | 1,936 |
| Eden, MD | 846 | 673 | 3,283 | 3,955 |
| Greendale, MO | 847 | 543 | 2,280 | 2,823 |
| Newell, IA | 845 | 296 | 1,582 | 1,878 |
| Armstrong, IA | 846 | 317 | 1,694 | 2,011 |