Across all these cities, the pattern is consistent: Rat prevalence has less to do with isolated infestations and more to do with how urban systems manage waste, density and underground infrastructure. America’s most rat-infested cities are not unique. They are large environments where human activity has inadvertently created stable conditions for rodent ecosystems.Cities like New York, Chicago, and Los Angeles consistently rank at the top not because of their unique “dirtyness,” but because of their dense populations, aging infrastructure, and endless food waste. The result is a stable pattern that repeats year after year in America’s urban centers. These cities consistently appear in pest control rankings, such as Orkin’s most recent 2025 annual “Cities with the Most Rats” report, which is based on residential treatment data rather than direct wildlife counts. Over time, these rankings reveal stable structural patterns in major U.S. urban environments.
List of rat-infested cities in the United States
Ranking of the most rat-infested cities in the United States
Los Angeles, California
Due to its urbanization patterns and year-round warm weather, Los Angeles is considered one of the most rat-prone cities in the United States. Unlike other places where rat populations fluctuate with the seasons, rats in Los Angeles remain consistent due to comfortable habitat conditions. Busy urban business districts, as well as underground highway tunnels and storm drains used by rats for transportation, create large amounts of waste food. Even after adopting strict sanitation methods and pest control programs, Los Angeles remains infested with rats due to its conducive environment.
Chicago, Illinois
The reason Chicago ranks among the most rat-infested cities in the United States has to do with its unique blend of old infrastructure and food service corridors. Alleys built in the past to transport garbage have now become convenient refuge and activity places for rats. Underground connectivity is provided by a system of metro tunnels and infrastructure close to rivers. Another factor that contributes to this problem is changes in weather. Control measures in Chicago often target repeated treatments rather than eradication because the urban structure continually creates opportunities for rat activity.
New York City, New York
When it comes to the most rat-infested urban centers in the United States, New York has become the most discussed city, especially because of its dense population and visible waste infrastructure on its streets. The city generates millions of pounds of trash every day, and despite attempts to improve existing waste disposal systems, visible trash on the streets continues to attract rats. Subway tunnels, building cellars and other underground facilities together form a network where rats breed year-round. However, it is worth noting that the city has also made significant efforts to develop rodent control measures.
San Francisco, California
San Francisco ranks as one of the most rat-prone cities in the United States, which can be attributed to the presence of its urban core and aging underground infrastructure. The hilly nature of San Francisco results in irregular garbage collection, especially in hilly residential areas that are difficult to access. Commercial areas generate constant food waste, while aging sewers provide reliable underground access.Other causes include high-density construction activity, which often displaces rats from existing habitats and forces them to move to other nearby buildings. Unlike large cities, San Francisco’s limited area increases the intensity of local epidemics.
Hartford, Connecticut
What makes Hartford unique in standing out on the list of the most rat-infested cities in America is the unusual fluctuations in its ranking, such as a sudden rise, such as (+8). Unlike other major metropolitan areas, Hartford experiences all rodent-related difficulties within its urban core because of the presence of older mixed-use facilities with easy access to buildings. Climate changes during certain seasons, especially colder periods when rodents move indoors, can also cause this problem. Hartford is a relatively small city, which means any change in pest control reporting, no matter how small, will affect its ranking.
washington d.c.
Washington, D.C., frequently ranks among the most rat-infested cities in the United States because of its historic neighborhoods, dense government infrastructure, and extensive underground utility systems. Older terraced housing estates provide abundant entry points to residential structures, while commercial corridors create predictable cycles of food waste. The city’s seasonal climate also plays a role, as warmer months increase surface activity in parks and transit-adjacent areas. Pest control efforts are often complicated by overlapping jurisdictions between federal, municipal, and private property management systems.
Detroit, Michigan
Detroit’s inclusion on the list of the most rat-infested cities in the United States can be explained by the city’s long history of industrial development, as well as its unequal urban renewal process. Much of Detroit consists of old housing, abandoned buildings and unused industrial land that have become unintentional havens for rats. Vacant buildings become natural breeding grounds for these pests, and pest control often fails due to neglect. On the other hand, new urban areas and commercial centers generate large amounts of waste.
Philadelphia, Pennsylvania
Philadelphia’s industrial past has contributed greatly to the city’s reputation as one of the most rat-infested cities in the United States. The combination of old warehouses, compact rows of houses and sewer systems creates a network of spaces that make rats comfortable. Additionally, proximity to rivers is another factor that makes urban life easier for rodents. Issues related to waste management in older parts of the city are another issue.
Minneapolis, Minnesota
The city’s inclusion on the list of the most rat-infested cities in the United States is interesting because Minneapolis seems to defy common sense associated with northern cities. While winter reduces surface activity for rats due to cold weather, it forces them indoors, with basements and heating systems becoming stable environments for their survival. Densely populated urban centers and their riverbanks also facilitate the movement of these pests. Seasonal changes can bring about significant changes in the number of sightings, but not necessarily changes in the population.
Denver, Colorado
Denver ranks among the most rat-infested cities in the United States, which can be attributed to rapid urbanization and changes in infrastructure. Expanding food service areas and construction projects always disrupt the normal lifestyle of rodents, forcing them to move from one area to another. Pest control effectiveness within Denver varies to varying degrees due to the presence of ancient and modern communities. Additionally, the climate is milder compared to cities in northern latitudes, meaning activities are possible year-round.
