- Village Office | (608) 337-4381 | 205 State St. Ontario, WI 54651 | Website: ontariowi.com/ontario | Email: villageofontario@centurytel.net | Hours: Mon. – Thurs. 8:30 am to 4:30 pm
- Police Department | (608) 337-4800 | 313 Main St. Ontario, WI 54651 | Website: ontariowi.com/ontario/policedepartment | Email: ontario@centurytel.net
- Regional Center Municipal Court | (608) 464-7667 | Judge Richard Tyler
- Ontario Fire and Rescue | (608) 337-4315 | 205 State St. Ontario, WI 54651 | Website: ontariofireandrescue.com
- Ontario Public Library | (608) 337-4651 | 313 Main St. Ontario, WI 54651 | Website: wrlsweb.org/ontario | Email: ontlibr@wrlsweb.org | Hours: Mon. 10:00 am to 5:00 pm; Tues. 12:00 pm to 6:00 pm; Wednesday 10:00 am to 6:00 pm; Friday 10:00 am to 5:00 pm; Saturday 9:00 am to 12:00 pm
- Ontario Post Office | (608) 337-4722 | 321 Main St. Ontario, WI 54651 | Website: usps.com | Hours: Mon. – Fri. 9:00 am to 1:00 pm; Sat. 8:30 am to 9:00 am
- Norwalk-Ontario-Wilton School District | (608) 337-4401 | 28861 State Hwy 131 Ontario, WI 54651 | Website: now.k12.wi.us