According to the UN, at least 55% of the world’s population lives in urban areas today. In the United States, that number rises to around 80% living in urbanized areas with 5,000+ residents. This number will continue rising, with projections reaching 89% by 2050. Smart city security systems have emerged in recent years, combining physical and digital technologies to match that growth. This article explains how cities link video surveillance, AI analytics, IoT sensors, access control and emergency notification tools into one system to detect threats, protect critical infrastructure and keep services running. Key Takeaways - Smart city security connects video, sensors, access control, AI analytics and emergency tools into one system to protect critical infrastructure and public safety. - Cities are moving from reactive incident response to proactive prevention using AI, IoT sensors and automated security workflows that can trigger alerts and lockdowns in seconds of detecting a visible weapon. - Integrated systems improve operational efficiency by coordinating transportation, utilities and law enforcement through shared real-time data feeds and unified command centers. - Modern city security must address both physical security and cybersecurity to protect critical systems like power, water, transit and communications where interconnected systems can create cascading risks across multiple services. What Is a Smart City Security System? A smart city security system combines physical security, cybersecurity and data analytics across an entire city’s infrastructure. They often mix video surveillance and AI analytics with access control, environmental sensors and emergency management platforms. The result is a “smart city” where transportation networks, utilities, law enforcement and city services can share data through integrated platforms and command centers. Typical components include: - Smart cameras using AI to detect weapons and/or abnormal behavior - Card and biometric access control at public infrastructure - Connected sensors monitoring air quality, flooding and