| Statistic | Reportedincidents | /100k people | Arnold/100k people | Maryland/100k people | National/100k people |
| Total crime | 0 | n/a (estimate) | 1,478 (estimate) | 2,470 | 2,119 |
| Murder | n/a | n/a | n/a | 7.2 | 5.0 |
| Rape | n/a | n/a | n/a | 33.0 | 37.5 |
| Robbery | n/a | n/a | n/a | 123.2 | 60.6 |
| Assault | n/a | n/a | n/a | 257.0 | 256.1 |
| Violent crime | n/a | n/a (estimate) | 251 (estimate) | 420 | 359 |
| Burglary | n/a | n/a | n/a | 190.0 | 229.2 |
| Theft | n/a | n/a | n/a | 1,446.8 | 1,272.1 |
| Vehicle theft | n/a | n/a | n/a | 412.8 | 258.8 |
| Property crime | n/a | n/a (estimate) | 1,227 (estimate) | 2,050 | 1,760 |


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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 |
| Galesville, MD | 1,262 | 59 | 288 | 347 |
| Crownsville, MD | 1,473 | 59 | 288 | 347 |
| Herald Harbor, MD | 2,414 | 66 | 322 | 387 |
| Arden on the Severn, MD | 1,457 | 79 | 387 | 466 |
| Rock Hall, MD | 1,563 | 0 | 505 | 505 |
| Gambrills, MD | 2,929 | 94 | 457 | 550 |
| Riva, MD | 4,321 | 109 | 532 | 642 |
| Arnold, MD | 24,334 | 251 | 1,227 | 1,478 |
| City | Population | Violent crime/100k people | Property crime/100k people | Total crime/100k people |
| Mequon, WI | 24,357 | 39 | 559 | 598 |
| Papillion, NE | 24,310 | 34 | 1,004 | 1,038 |
| Avon Lake, OH | 24,309 | 19 | 290 | 310 |
| Palmetto Bay, FL | 24,308 | 148 | 2,017 | 2,165 |
| Harvey, IL | 24,295 | 706 | 1,511 | 2,217 |
| Arnold, MD | 24,334 | 251 | 1,227 | 1,478 |