KEY TAKEAWAYS:   Louisiana ranks fourth in the U.S. for overall mosquito population and has 68 mosquito species, the fourth most nationwide.   The state’s warm, humid climate, frequent rainfall and abundant water create ideal breeding conditions year-round.   Louisiana reported 64 West Ni le virus cases in 2025, ranking ninth nationally for reported infections.   Southern house mosquitoes, Asian tiger mosquitoes and floodwater mosquitoes are among the state’s most common species.   Bug spray is an everyday necessity in Louisiana, as mosquitoes in the state are active year-round. Mosquitoes thrive in Louisiana’s climate, as ample rainfall and bodies of water provide optimal breeding grounds and the insects favor humidity and mild winters. All of these factors contribute to the state’s high mosquito population, abundant number of mosquito species and high volume of West Nile cases reported annually. Louisiana and mosquitoes While the exact count of mosquitoes in Louisiana is impossible to calculate, the state is estimated to have the fourth highest mosquito population in the U.S. The 10 states with the most mosquitoes, according to World Population Review: Alabama Florida Georgia Louisiana Montana North Carolina Oklahoma South Dakota Texas Virginia The 10 states with the least mosquitoes, according to World Population Review: Arizona California Delaware Hawaii Nevada West Virginia Alaska Arkansas Colorado Connecticut Louisiana has the fourth highest number of mosquito species. How many does the state have? Louisiana is home to a total of 68 species of mosquito, making it the state with the fourth most species. The three most common species of mosquito in Louisiana include southern house mosquitoes, Asian tiger mosquitoes and floodwater mosquitoes, says JJ Exterminating. Here’s how Louisiana compares to other states in terms of mosquito species, according to World Population Review: Texas: 85 Florida: 80 New York: 70 Louisiana: 68 Georgia: 63 South Carolina: 61 Alabama: 60 Kentucky: 60 New Jersey: 60 North Carolina: 60 Oklahoma: 60 Pennsylvania: 60 Ohio: 59 Delaware: 57 Iowa: 57 New Mexico: 57 Wisconsin: 56 Arkansas: 55 Indiana: 55 Michigan: 55 Connecticut: 54 Illinois: 52 Massachusetts: 51 California: 50 Idaho: 50 Maryland: 50 Minnesota: 50 Mississippi: 50 Missouri: 50 Montana: 50 Nebraska: 50 Oregon: 50 Utah: 50 Virginia: 50 Rhode Island: 46 Colorado: 45 Maine: 45 Vermont: 45 Wyoming: 45 New Hampshire: 43 South Dakota: 43 Arizona: 40 Nevada: 40 Washington: 40 North Dakota: 38 Alaska: 30 West Virginia: 26 Tennessee: 9 Hawaii: 8 Kansas: 2 Louisiana among states that report the most cases of West Nile virus. How many cases were reported in 2025? A total of 1,941 cases of West Nile virus were reported in the U.S. in 2025 and 64 were reported in Louisiana the same year, making the state rank ninth for total cases of West Nile reported in 2025. West Nile virus has been actively spreading throughout Louisiana since its first detection in the state in 2002, says the Louisiana Department of Health. How Louisiana compares to other states in terms of West Nile virus cases reported in 2025, according to World Population Review: Colorado: 283 Illinois: 136 Minnesota: 112 Texas: 104 California: 98 North Dakota: 86 South Dakota: 86 Pennsylvania: 80 Louisiana: 64 Arizona: 63 New York: 56 Oklahoma: 53 Nebraska: 52 New Mexico: 51 Iowa: 49 Utah: 48 Michigan: 46 Ohio: 44 Indiana: 38 Kentucky: 35 Missouri: 34 Mississippi: 32 Kansas: 29 Maryland: 27 Wisconsin: 26 Virginia: 25 Alabama: 24 Arkansas: 24 New Jersey: 21 Tennessee: 16 Georgia: 15 Wyoming: 14 Montana: 11 Idaho: 9 Massachusetts: 9 North Carolina: 9 Connecticut: 6 Florida: 6 Washington, D.C.: 4 South Carolina: 4 Delaware: 3 Oregon: 2 Rhode Island: 2 Washington: 2 West Virginia: 2 Maine: 1 ...read more read less