City Of O'fallon Salaries . City of O'Fallon, 255 South Lincoln, O'Fallon, IL 62269 Tel: (618) 624-4500 Fax: (618) 624-4508 City Hall Hours: Monday - Friday, 8:00 am - 5:00 pm Website Disclaimer | Government Websites by CivicPlus ® O'Fallon Municipal Centre 100 North Main Street O'Fallon, MO 63366 Phone: 636-240-2000 Hours: Mon. The Department works to market and promote the area for new business investment, economic growth, quality development and the creation of job opportunities. – Fri., 9 a.m. – 3:30 p.m. 326 were here. O'Fallon is a city in St. Clair County, Illinois, United States.The 2010 census listed the population at 28,281. Compare pay for popular roles and read about the team’s work-life balance. Easy 1-Click Apply (CITY OF O'FALLON) Police Officer 2021 B job in O'Fallon, MO. Our quiet neighborhoods, welcoming residents and strong economy rooted in local business are the foundations of what makes our community so special. O'Fallon Municipal Centre 100 North Main Street O'Fallon, MO 63366 Phone: 636-240-2000 Hours: Mon. See if you qualify! View job description, responsibilities and qualifications. The City of O’Fallon makes every effort to fully comply with the Americans with Disabilities Act and will provide reasonable accommodations to qualified individuals. Number of employees at City Of O'fallon in year 2017 was 435. If you need assistance or an accommodation for the application, interview or a particular testing process, please contact the Human Resources Department at 636-240-2000. Get the inside scoop on jobs, salaries, top office locations, and CEO insights. The City of O’Fallon’s Economic Development Department is proactive in developing relationships with businesses seeking to locate, retain or expand their operation in O’Fallon. Welcome to the City of Fallon website, where we invite you to explore all that our community has to offer as either a citizen, future resident or a visitor. Uncover why City of O'Fallon is the best company for you. Welcome to the official Facebook page of the City of O'Fallon… Find out what works well at City of O'Fallon from the people who know best. – Fri., 9 a.m. – 3:30 p.m. Average annual salary was $56,009 and median salary was $55,266. See why over 1,100 businesses and 30,000 residents have made O’Fallon, IL the fastest-growing city in the St. Louis Metro East.