| Statistic | Reportedincidents | /100k people | Arnold/100k people | Maryland/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | 1,494 (estimate) | 2,497 | 2,281 |
| Murder | n/a | n/a | n/a | 8.3 | 5.7 |
| Rape | n/a | n/a | n/a | 31.9 | 38.0 |
| Robbery | n/a | n/a | n/a | 130.7 | 66.5 |
| Assault | n/a | n/a | n/a | 255.2 | 264.1 |
| Violent crime | n/a | n/a (estimate) | 255 (estimate) | 426 | 364 |
| Burglary | n/a | n/a | n/a | 185.9 | 250.7 |
| Theft | n/a | n/a | n/a | 1,337.8 | 1,347.2 |
| Vehicle theft | n/a | n/a | n/a | 547.4 | 318.7 |
| Property crime | n/a | n/a (estimate) | 1,239 (estimate) | 2,071 | 1,917 |


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| Item | Arnold | Maryland | National |
| Law enforcement employees (officers & civilians) | n/a | 5,343 | 558,732 |
| Police officers & civilians /1000 residents | n/a | 3.3 | 3.3 |
| State | Total offenders | Maryland /100K | National /100K |
| Maryland | 7,370 | 135 | 266 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Rock Hall, MD | 1,563 | 0 | 334 | 334 |
| Galesville, MD | 1,262 | 60 | 291 | 350 |
| Crownsville, MD | 1,473 | 60 | 291 | 350 |
| Herald Harbor, MD | 2,414 | 67 | 325 | 392 |
| Arden on the Severn, MD | 1,457 | 80 | 391 | 471 |
| Gambrills, MD | 2,929 | 95 | 461 | 556 |
| Riva, MD | 4,321 | 111 | 538 | 649 |
| Arnold, MD | 24,334 | 255 | 1,239 | 1,494 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Mequon, WI | 24,357 | 59 | 594 | 653 |
| Papillion, NE | 24,310 | 51 | 1,238 | 1,289 |
| Avon Lake, OH | 24,309 | 8 | 392 | 399 |
| Palmetto Bay, FL | 24,308 | 178 | 1,909 | 2,087 |
| Harvey, IL | 24,295 | 1,085 | 3,135 | 4,220 |
| Arnold, MD | 24,334 | 255 | 1,239 | 1,494 |