What are the worst cities and states for mosquitoes?
Updated on: April 17th, 2026
Key takeaways
- The cities with the most mosquito activity include New York, Dallas-Ft. Worth, Los Angeles, Philadelphia, and Atlanta. These areas have conditions that make it easy for mosquitoes to thrive.
- Mosquitoes are most common in regions with warm temperatures, high humidity, and standing water, which can create ideal breeding environments.
- States with dry, windy, or cooler climates tend to have fewer mosquitoes and shorter mosquito seasons.
- If mosquitoes are a problem, professional mosquito control from Terminix can help reduce populations and protect your yard.
Jump to section:
What cities have the most mosquitoes?
What are the top mosquito-infested states?
What states have the fewest mosquitoes?
Do you live in one of the top mosquito cities or states?
There’s nothing worse than being chased indoors by mosquitoes when all you want is to enjoy your yard. While they may seem like little more than annoying pests that leave itchy red bumps, mosquitoes are actually considered the world’s deadliest animal due to the diseases they can carry.
Using 2025 service data from over 300 Rentokil-owned Terminix branches, we’ve identified the worst states and cities for mosquitoes based on where homeowners most often needed mosquito treatments.1 Check the list to see if you live in one of the top mosquito cities.
What cities have the most mosquitoes?
Mosquito activity is highest in areas with warm temperatures, humidity, and standing water where mosquitoes can breed. To identify the worst mosquito cities, Terminix has identified the top 50 mosquito-infested cities across the United States. The list of these cities was compiled using service data from over 300 of our branches located throughout the country, based on where residents used the highest number of mosquito control services in 2025 in our designated market areas.1
The top five cities where mosquitoes are most common are New York, Dallas-Ft. Worth, Los Angeles, Philadelphia, and Atlanta. New York City claimed the top spot due to exceptionally warm and wet weather. While Los Angeles, Dallas, and Atlanta consistently rank high because of their long, warm seasons, New York’s spike in humidity and rainfall has propelled it to the number one position.
- New York, NY
- Dallas-Ft. Worth, TX
- Los Angeles, CA
- Philadelphia, PA
- Atlanta, GA
- Louisville, KY
- Washington, D.C.
- Boston, MA
- Detroit, MI
- Houston, TX
- Tampa-St. Pete, FL
- Lexington, KY
- Nashville, TN
- Pittsburgh, PA
- San Antonio, TX
- Memphis, TN
- Orlando, FL
- Little Rock, AR
- Chicago, IL
- Miami-Ft. Lauderdale, FL
- Baltimore, MD
- San Francisco, CA
- Providence, RI
- Oklahoma City, OK
- Sacramento, CA
- Palm Springs, CA
- Indianapolis, IN
- Cleveland, OH
- West Palm Beach, FL
- Mobile, AL
- Cincinnati, OH
- Fresno, CA
- Jacksonville, FL
- Birmingham, AL
- Harlingen, TX
- Columbus, OH
- Wilkes Barre, PA
- Milwaukee, WI
- San Diego, CA
- Austin, TX
- Kansas City, MO
- Jackson, MS
- Richmond, VA
- Tyler, TX
- Shreveport, LA
- Tulsa, OK
- Hartford, CT
- Paducah, KY
- Ft. Myers, FL
- Charleston, WV
What types of mosquitoes and diseases are common in cities?
In the United States, two mosquito groups are responsible for most activity in urban areas: Aedes and Culex. Both adapt well to city environments where small water sources, such as gutters, containers, and storm drains, create ideal breeding spots. Aedes mosquitoes are usually active during the daytime and often breed in small amounts of standing water around homes. Culex mosquitoes tend to be more active in the evening and overnight and are commonly found near larger water sources.
Both types are known carriers of mosquito-borne diseases. In the U.S., the most commonly reported illnesses include West Nile virus, dengue, Zika virus, and chikungunya.2 According to the CDC, West Nile virus is the leading mosquito‑borne disease in the continental U.S., with about 2,000 diagnosed cases each year—though the actual number of infections is likely higher because many people have mild or no symptoms.
What are the top mosquito-infested states?
If you’ve ever wondered what state has the worst mosquitoes, it often comes down to climate, rainfall, and breeding conditions. Texas, California, and Florida remain repeat offenders, while Pennsylvania and Kentucky make their first appearance in the top five this year.1 Warmer-than-usual springs, wetter summers, and expanding urban and suburban breeding grounds have created ideal conditions for mosquito populations to surge. The top ten worst states for mosquitoes are:
What states have the least mosquitoes?
Nevada, Idaho, Utah, Vermont, and South Dakota rank among the top five states with the lowest mosquito populations.1 Unlike warmer, wetter regions where mosquitoes thrive, these states are dry and windy, less hospitable to breeding. The ten states with the fewest mosquitoes this year are:
- Nevada
- Idaho
- Utah
- Vermont
- South Dakota
- Hawaii
- Minnesota
- New Mexico
Do you live in one of these top mosquito cities or states?
Living in one of the worst cities or states for mosquitoes does not mean mosquito problems are unavoidable. Mosquito prevention plays an important role in reducing activity around your home. Simple steps like removing standing water, cleaning gutters, trimming vegetation, and maintaining outdoor areas can help limit breeding sites in places where mosquitoes are most common.
Mosquito activity shouldn’t be a guessing game. Terminix technicians provide expert mosquito control, identifying breeding areas and treating active populations to help make your outdoor spaces more comfortable. For even greater protection, you can upgrade to our combined Mosquito + Tick Control service, which targets both pests for long-term prevention.
Contact us to schedule mosquito control services today!