NOTE: E-mail address are NOT for use as emergency contacts.
| Office | Address | Phone | |
| Mayor's Office | 401 Fremont | 402-336-3640 | |
| City Clerk | 401 Fremont | 402-336-3640 | njohnston@cityofoneill.com |
| Police Chief | 317 S. 4th St. | 402-336-1313 | oneillpd@morcomm.net |
| Police Non Emergency | 317 S. 4th St. | 402-336-1955 | |
| Police Emergency | 911 | ||
| Ambulance | 304 S. 4th St. | 402-336-4834 | |
| Fire Non Emergency | 304 S. 4th St. | 402-336-3034 | |
| Fire Emergency | 911 | ||
| Automated Weather Service | 402-336-4834 | ||
| Water Department | 401 E. Fremont | 402-336-1355 | |
| Water Polution Control Plant | 402-336-3350 | ||
| O'Neill Public Swimming Pool | Ford Park | 402-336-1572 |