Home & Business Security Systems in O'Fallon, MO
Citywide Alarms has been protecting O’Fallon homes and businesses since 2010 with professionally installed alarm systems, security cameras, access control, and smart home automation.
Our Office Near O'Fallon, MO
Home Security Specialists For St. Charles County
Just 20 minutes from O’Fallon, Citywide Alarms is a family-owned security company installing home and business alarm systems, security cameras, access control, and smart home automation throughout the area. Our St. Charles office at 965 Sycamore Dr is a little over 10 miles away, and our team handles everything from installation to ongoing monitoring and support. Schedule your free estimate today.
A Local Leader In Home & Business Security
Home Alarms
Our wireless home alarm systems catch a break-in as it happens and alert our 24/7 monitoring center right away.
Learn MoreSecurity Cameras
Sharp HD cameras inside and out give you a clear view of your property at any hour, right from your phone.
Learn MoreSmart Home Devices
Your doorbell, locks, garage, thermostat, and lights work together in one app, connected to your security system.
Learn MoreBusiness Alarms
Professional business alarms guard your building, your team, and your stock around the clock, monitored by our 24/7 center.
Learn MoreAccess Control
Control who gets in and at what time with keyless access, whether you’re securing one door or a full facility.
Learn MoreCloud Storage
Keep your recordings safe in the cloud, where they stay protected and easy to access no matter what happens to the camera.
Learn MoreFire Alarm Systems
Code-compliant fire detection for your business, with 24/7 monitoring that gets emergency crews moving at the first sign of smoke.
Learn MoreMonitored Cameras
Our monitoring team checks live video before dispatching, so false alarms drop and genuine emergencies get help faster.
Learn MoreWhy O'Fallon Choose Citywide Alarms
A good security company earns trust by being reliable and easy to reach. For O’Fallon customers, that’s what Citywide Alarms has delivered since 2010 as a family-owned business, backed by an A+ BBB rating, 4.8+ stars across 100+ reviews, two Angie’s List Super Service Awards, and KSDK Channel 5’s recognition as the #1 provider of video doorbells in St. Louis. Every system is fully wireless and runs on Alarm.com, and because we only support equipment we installed ourselves, our team already knows your setup when you call. Our St. Charles office is only about 20 minutes away.
What St. Charles County Thinks Of Us
Frequently Asked Questions
How quickly can Citywide Alarms get to O’Fallon, MO?
Our St. Charles office is a little over 10 miles and about 20 minutes from O’Fallon, so our technicians are close by for free estimates, installations, and service visits.
Can you install a security system for my O’Fallon business?
Yes. We install business alarm systems, security cameras, access control, and commercial fire alarm systems, all backed by our 24/7 monitoring center.
Will my alarm keep working if the power or internet goes out?
Yes. Our systems run on a dedicated cellular connection, so they stay linked to our monitoring center even if the power or internet drops. Backup batteries typically last 18 to 36 hours, depending on your system.
Do you offer smart home installation in O’Fallon?
Yes. We install video doorbells, smart locks, garage door control, thermostats, and lighting, all managed from one app alongside your alarm and camera system.
Proudly Serving O'Fallon and Beyond
Citywide Alarms provides trusted security solutions throughout St. Charles County and surrounding communities. Whether you’re a home or a business, we’re ready to help you protect what matters most.
- St. Charles965 Sycamore Dr.
St. Charles, MO 63304
Contact Us For A Quote
If we didn’t answer all of your questions, feel free to contact us at anytime.