Ontario, Canada’s most populous and economically vibrant province, is often celebrated for its safety and livability. However, some cities within Ontario face serious challenges with crime. In this blog, we dive into the top 10 most dangerous cities in Ontario for 2025. Our analysis is based on the latest data from Statistics Canada, municipal police services, and updated Crime Severity Index (CSI) and Violent Crime Severity Index (VCSI) scores.

Understanding Crime Rates in Ontario

While Ontario as a whole is relatively safe, understanding crime patterns is critical. The Crime Severity Index (CSI) measures both the volume and seriousness of police-reported crime, while the Violent Crime Severity Index (VCSI) focuses on violent crimes like assault, robbery, and homicide.

This list of the 10 most dangerous cities in Ontario is intended to inform residents, visitors, investors, and policymakers about safety concerns and crime trends in various urban centres.

Top 10 Most Dangerous Cities in Ontario 2025

1. Thunder Bay

• CSI (2023): 88.3
• VCSI: Among the highest in Canada
• Key Issues: Homicide, robbery, drug abuse, poverty

Thunder Bay continues to top the list of the most dangerous cities in Ontario. It has one of the highest homicide rates in Canada and struggles with drug-related violence and property crime. Socioeconomic disparities, homelessness, and substance abuse contribute to the city's elevated crime levels.

Why It’s Dangerous: Persistent violent crime and under-resourced social support systems.

Safety Tips: Stick to well-lit areas, secure homes and businesses, and stay connected with community safety groups.

2. Sudbury

• CSI (2024): 61.9
• VCSI: 60.46
• Key Issues: Assault, drug trafficking, break-ins

Sudbury has earned its place on the list of the top 10 most dangerous cities in Ontario due to the rise in violent incidents over the past few years. Economic challenges and limited access to healthcare, especially mental health services, worsen the situation.

Why It’s Dangerous: High rates of violence linked to drug use and unemployment.

Safety Tips: Avoid isolated areas, lock up valuables, and use monitored parking.

3. Sault Ste. Marie

• CSI (2024): 60.2
• VCSI: 60.28
• Key Issues: Theft, assault, property damage

Located near the U.S. border, Sault Ste. Marie experiences elevated crime levels due to cross-border trafficking and local economic difficulties. Police resources are stretched thin.

Why It’s Dangerous: Border proximity increases smuggling and drug-related crimes.

Safety Tips: Secure personal property and report any suspicious behavior to local authorities.

4. Brantford

• CSI (2023): 86.4
• VCSI: High
• Key Issues: Homicides, vehicle theft, break-ins

Brantford is one of the most dangerous cities in Ontario due to its high rate of violent crime. Organized criminal activities and repeated property theft incidents impact the overall safety.

Why It’s Dangerous: Strong presence of gang-related activity and property crime.

Safety Tips: Invest in security systems and avoid known high-risk neighborhoods.

5. London

• CSI (2024): 53.9
• VCSI: Elevated
• Key Issues: Fraud, robbery, assault, bike theft

London's diverse population and growing urban areas have led to increased property crime. Its violent crime rate has been on the rise, making it one of the 10 most dangerous cities in Ontario.

Why It’s Dangerous: Drug use, homelessness, and fraud-related offenses.

Safety Tips: Use anti-theft devices, stay aware in downtown areas, and report incidents promptly.

6. Windsor

• CSI (latest): ~50
• Key Issues: Homicide, property crimes, drug trade

Windsor has long dealt with criminal activity stemming from its location at the U.S. border. Vehicle theft and drug trafficking continue to impact the crime statistics.

Why It’s Dangerous: Cross-border crimes and limited law enforcement coverage.

Safety Tips: Be cautious in border zones and secure personal property.

7. Oshawa

• CSI (2024): 59.34
• Key Issues: Petty crime, vandalism, drug offenses

Oshawa’s CSI has been gradually increasing, landing it in the top 10 most dangerous cities in Ontario. Property crime and drug-related offenses are the primary contributors.

Why It’s Dangerous: Petty crimes often escalate into more serious issues.

Safety Tips: Monitor public areas closely and avoid public intoxication zones.

8. Hamilton

• CSI (2024): 55.8
• Key Issues: Break-ins, theft, drug abuse

Hamilton struggles with industrial decline and poverty, leading to increased criminal activities. The CSI reflects ongoing issues with both violent and non-violent crimes.

Why It’s Dangerous: Lack of economic opportunities leads to increased theft and drug issues.

Safety Tips: Use alarm systems and neighborhood watch initiatives.

9. Kitchener

• CSI: Above provincial average
• Key Issues: Residential break-ins, theft, vandalism

Kitchener’s steady population growth and urban sprawl have contributed to higher crime rates. While considered relatively safe in the past, current crime stats place it among the most dangerous cities in Ontario.

Why It’s Dangerous: Expanding urban population without adequate law enforcement support.

Safety Tips: Secure properties and stay active in community programs.

10. Brampton

• CSI (2024): 55.3
• Key Issues: Vehicle theft, gang activity

Brampton’s inclusion in the top 10 most dangerous cities in Ontario is largely due to its rapid growth and challenges in policing. Organized crime is a rising concern.

Why It’s Dangerous: Fast urbanization outpaces law enforcement capabilities.

Safety Tips: Avoid risky locations after dark and use secure parking lots.

Factors Behind Crime in Ontario’s Most Dangerous Cities

• Poverty and Unemployment: Affects cities like Thunder Bay, Sudbury, and Hamilton.
• Drug Trafficking: Prominent in Windsor, Oshawa, and London.
• Border Proximity: Raises crime rates in Sault Ste. Marie and Windsor.
• Population Growth: Brampton and Kitchener are growing rapidly, creating policing gaps.

Safety Tips for Residents and Visitors

• Install security systems at home or business
• Park in secure, well-lit areas
• Stay informed via local crime maps and community watch apps
• Report crimes promptly to local police or Crime Stoppers

FAQs: Most Dangerous Cities in Ontario

1. What is the most dangerous city in Ontario?

Thunder Bay is currently considered the most dangerous city in Ontario, due to its high violent crime rate and social issues like drug abuse and homelessness.

2. Why are crime rates so high in some Ontario cities?

Common causes include economic disparity, substance abuse, limited police resources, and proximity to borders, which facilitate drug trafficking and organized crime.

3. Are all parts of these cities dangerous?

No. Most cities have high-risk zones and safer neighbourhoods. It’s crucial to research local crime maps before visiting or relocating.

4. How can I stay safe while visiting Ontario?

Stick to well-trafficked, well-lit areas, secure your belongings, and stay updated on local alerts.

5. What are the safest cities in Ontario?

Some of Ontario’s safest cities include Oakville (CSI: 26.1), Burlington (CSI: 29.7), and regions within Halton.

6. How does Ontario compare to other provinces in terms of crime?

Ontario generally ranks as one of the safer provinces in Canada, despite having several cities with elevated crime rates.

7. Why is Thunder Bay always on the list of most dangerous cities in Ontario?

Thunder Bay frequently ranks high due to a combination of violent crime, drug addiction, poverty, and limited social services.

8. Is it safe to live in Ontario despite some cities having high crime rates?

Yes. Many parts of Ontario are very safe. It's important to choose neighbourhoods with strong community policing and low crime stats.

9. Do high CSI scores always mean a city is unsafe?

Not necessarily. CSI scores reflect reported crimes and severity but don’t account for localized differences. Some high-scoring cities have safe communities within them.

10. Can crime prevention programs help reduce Ontario’s crime rate?

Yes. Community engagement, youth programs, better mental health support, and proactive policing can help address root causes of crime.

Conclusion: Navigating the Most Dangerous Cities in Ontario

While Ontario overall ranks as one of Canada’s safest provinces, these most dangerous cities in Ontario serve as a cautionary reminder that crime varies greatly by region. By understanding what drives crime in each of the 10 most dangerous cities in Ontario, both residents and visitors can take proactive steps toward safety.

Whether you're a tourist, local, or someone considering a move, staying informed about the most dangerous cities in Ontario Canada is crucial. With the right precautions, Ontario can still offer a rewarding and safe experience.