Across all these cities, the pattern is consistent: rat prevalence is less about isolated infestations and more about how urban systems manage waste, density, and underground infrastructure. The most rat-infested cities in the US are not anomalies; they are large-scale environments where human activity unintentionally 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, ageing infrastructure, and constant food waste streams. The result is a stable pattern that repeats year after year across US urban centres. 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 US urban environments.
List of rat-infested cities in the US
America’s most rat-infested cities ranked
Los Angeles, California
Los Angeles is known to be one of the top cities for rats in the US due to its urbanization patterns as well as warm weather all year round. Different from other places where the rat population changes depending on the season, rats live consistently in Los Angeles because of their comfortable habitat conditions. There is a lot of waste food produced by busy urban business areas, as well as underground tunnels through freeways and storm drains that rats use for transportation. Even after applying strict sanitation methods and pest control programs, Los Angeles stays rat-populated because of its supporting environment.
Chicago, Illinois
The reason why Chicago ranks among the most rat-infested cities in the US is related to its particular blend of old infrastructure and food service corridors. The alleys built in the past to transport trash have become convenient places of refuge and movement for rats. Subway tunneling systems, as well as the proximity of infrastructure to the rivers provide underground connectivity. Another factor which favours this problem is the change of weather. Control measures in Chicago usually target repetitive treatment as opposed to eradication, as the urban structure keeps creating opportunities for rat activity.
New York City, New York
New York has emerged as the most discussed city when it comes to citing the most rat-infested urban centers in America, especially because of the dense population and visible waste disposal infrastructure at the street level. Millions of pounds of waste are created every day in this city, and while there have been attempts at bettering the waste disposal system in place, the visible trash on streets continues to be a draw for rats. The subway tunnels, building cellars, and other underground utilities together comprise a network where rats thrive throughout the year. However, what is noteworthy is the fact that the city has also made significant efforts towards developing measures for rat infestations.
San Francisco, California
The classification of San Francisco among the cities most prone to rat infestations across the United States can be attributed to the presence of urban core areas and old underground infrastructure. The hilly nature of San Francisco makes for irregular garbage collections, especially in the hilly residential parts that are difficult to access. Business sections produce consistent food waste, while the aging sewer lines offer reliable passage ways underground.Other reasons include high density of construction activities, which often displace rats from their existing habitats and make them move into other nearby structures. Unlike big cities, the limited size of San Francisco increases the intensity of localized outbreaks.
Hartford, Connecticut
The peculiar aspect of Hartford that makes it stand out in the list of the most rat-infested cities in the United States is its unusual volatility in rankings, which is exemplified by sudden rises, such as (+8). Hartford, unlike other major metropolitan areas, experiences 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, especially colder periods when rodents move indoors, contribute to the problem as well. Hartford being a relatively small city means that any change in the reporting of pest control, no matter how slight, affects its ranking positions.
Washington, D.C.
Washington, D.C., regularly appears in 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, as warmer months increase surface activity in parks and transit-adjacent zones. Pest control efforts are often complicated by jurisdictional overlap between federal, municipal, and private property management systems.
Detroit, Michigan
The inclusion of Detroit in the list of the most infested cities with rats in the United States can be explained by the long history of industrial development of the city, as well as by the unequal process of urban renewal. Significant parts of Detroit include old housing, abandoned buildings, and unused industrial land, which inadvertently shelters rats. Unoccupied buildings become natural breeding places for these pests, where pest control is often impossible due to neglect. On the other hand, new urban areas and business centers produce abundant waste.
Philadelphia, Pennsylvania
The industrial past of Philadelphia makes a big contribution to the inclusion of the city among the cities infested with rats the most in the United States. A combination of old warehouses, compact rows of houses, and sewer systems form a network of spaces where rats can be comfortable. In addition, being located near the rivers is another factor making the life of rodents easier in the city. Problems associated with waste management in old areas of the city serve as an additional problem.
Minneapolis, Minnesota
This city is intriguing within the top rat-infested cities list of the US because Minneapolis seems to defy common knowledge related to cities in the north. Although winters lower rats’ surface activities because of the cold weather, they force them inside, where basements and heating system installations become stable environments for their survival. The dense central part of the city and its riverbanks contribute to the movement of these pests as well. The seasons bring observable changes in the level of sightings, yet not necessarily in population numbers.
Denver, Colorado
The occurrence of Denver in the rankings of the most rat-infested cities in the US can be attributed to the quick growth in urbanization, along with changes in the infrastructure. An expanding food service area and construction will always cause disturbances in the normal lifestyle of rodents, thereby forcing them to relocate from one area to another. There are varying degrees of pest control effectiveness within Denver due to the presence of old and modern neighbourhoods. Additionally, the climate here is milder compared to cities located in northern latitudes, which means that activities occur all throughout the year.
