In all of these cities, the pattern is consistent: The spread of rats is less about individual infestations and more about how urban systems manage waste, density and underground infrastructure. There is no discrepancy among the cities most infested by rats in the US; They are large-scale environments where human activity inadvertently creates stable conditions for rodent ecosystems.Cities like New York, Chicago, and Los Angeles consistently appear at the top, not because they are uniquely “dirty,” but because they combine dense populations, aging infrastructure, and constant food waste streams. The result is a stable pattern that is repeated year after year in American urban centers. These cities consistently appear in pest-control rankings, such as Orkin’s latest annual “Rattiest Cities” report for 2025, which is based on residential treatment data rather than direct wildlife counts. Over time, these rankings reveal stable structural patterns across major U.S. urban environments.
List of rat infested cities in America
| Post |
City |
State |
| 1 | los angeles | California |
| 2 | chicago | Illinois |
| 3 | new york city | new york |
| 4 | san francisco | California |
| 5 | hartford | connecticut |
| 6 | Washington DC | District of Columbia |
| 7 | detroit | michigan |
| 8 | philadelphia | pennsylvania |
| 9 | minneapolis | minnesota |
| 10 | denver | colorado |
Ranking of America’s most rat-infested cities
Los Angeles, California
Los Angeles is considered one of the top cities for rats in the US due to its urbanization pattern as well as warm weather throughout the year. Unlike other places where rat populations fluctuate depending on the season, rats in Los Angeles are persistent due to their comfortable housing conditions. There is a lot of food waste produced by busy urban commercial areas as well as underground tunnels through freeways and storm drains that rats use to transport. Even after implementing strict sanitation methods and pest control programs, Los Angeles remains rat-populated due to its supportive environment.
Chicago, Illinois
Chicago’s place among the cities most infested by rats in the US is related to its particular mix of aging infrastructure and food service corridors. Lanes built in the past to transport garbage have become convenient places of shelter and roaming for rats. Subway tunneling systems, as well as the infrastructure’s proximity to rivers, provide underground connectivity. Another factor that favors this problem is the change of weather. Control measures in Chicago typically target repetitive treatments rather than eradication, as the urban structure continues to create opportunities for rat activity.
New York City, New York
When citing the most rat-infested urban centers in the US, New York has emerged as the most-discussed city, particularly due to its dense population and visible waste disposal infrastructure at street level. The city produces millions of pounds of garbage every day, and although efforts have been made to improve the garbage disposal system, visible trash on the streets remains an attraction for rats. Subway tunnels, building basements and other underground utilities together form a network where rats thrive year-round. However, what is noteworthy is that the city has also made significant efforts towards developing measures to combat rat infestation.
San Francisco, California
San Francisco’s classification among the cities most susceptible to rat infestation across the United States can be attributed to the presence of urban core areas and aging underground infrastructure. The mountainous nature of San Francisco makes garbage collection irregular, especially in hilly residential areas that are difficult to access. Commercial sections continually generate food waste, while old sewer lines provide reliable routes for underground passage.Other causes include high density of construction activities, which often displaces rats from their existing habitats and drives them to other nearby structures. Unlike larger cities, San Francisco’s limited size increases the intensity of localized outbreaks.
Hartford, Connecticut
The unique aspect of Hartford that makes it stand out on the list of cities most infested by rats in the United States is its unusual volatility in the rankings, exemplified by sudden increases, such as (+8). Hartford, unlike other major metropolitan areas, experiences not all rodent-related difficulties within the confines of its urban center due to the presence of older and mixed-use facilities that facilitate easy passage into structures. Climate changes during certain seasons, particularly cold periods when rodents move indoors, also contribute to the problem. Hartford being a relatively small city means that any change in pest control reporting, no matter how minor, affects its ranking position.
Washington DC
Washington, DC, regularly appears among the most rat-infested cities in the US due to its mix of historic neighborhoods, dense government infrastructure, and extensive underground utility systems. Older rowhouse districts provide abundant entry points into residential structures, while commercial corridors generate predictable food waste cycles. The city’s seasonal climate also contributes to this, as surface activity in parks and transit-adjacent areas increases in the warmer months. Pest control efforts are often complicated by jurisdictional overlap between federal, municipal, and private property management systems.
Detroit, Michigan
Detroit’s inclusion in the list of cities most infested by rats in the United States can be explained by the city’s long history of industrial development as well as the uneven process of urban renewal. Significant parts of Detroit include old housing, abandoned buildings, and unused industrial land, which unknowingly harbor rats. Vacant buildings become natural breeding grounds for these pests, with pest control often impossible due to neglect. On the other hand, new urban areas and commercial centers generate abundant amounts of waste.
Philadelphia, Pennsylvania
Philadelphia’s industrial past is a major contributor to the city being among the cities most infested by rats in the United States. The combination of old warehouses, dense rows of houses and sewer systems creates a network of places where rats can live comfortably. Moreover, being located near rivers is another factor making life easier for rodents in the city. Problems related to waste management in older areas of the city act as an additional problem.
minneapolis, minnesota
This city is interesting on the list of top rat-infested cities in America because Minneapolis defies common sense regarding cities in the North. Although winters reduce the surface activities of rats due to cold weather, they force them inside, where basements and installation of heating systems become stable environments for their survival. The dense central part of the city and its river banks also contribute to the movement of these pests. The seasons bring visible changes in visibility levels, yet not necessarily in population numbers.
Denver, Colorado
Denver’s rise to the ranking of most rat-infested cities in the US can be attributed to rapid growth in urbanization along with changes in infrastructure. An expanding food service area and construction will always cause disturbances in the normal lifestyle of rodents, forcing them to move from one area to another. There are varying degrees of pest control effectiveness within Denver due to the presence of older and modern neighborhoods. Additionally, the climate here is mild compared to cities located in northern latitudes, meaning activities take place all year round.