State Farm says it has received more than 15,000 claims from the storms; North Carolina Farm Bureau Insurance says it is treating the aftermath the same as a hurricane.
Insurers are beginning to size up the extent of damage left in the wake of storms that produced dozens of tornadoes that struck several Central Plains states, hail that caused damage in Texas, and strong winds and lightning in Georgia.
Allstate will be charging Mississippi homeowners an average of 19.4 percent more for insurance, and State Farm received approval for an average 18.8 percent rate hike in Florida.
Insurance companies are already handling thousands of claims in North Carolina after hundreds of tornadoes touched down from Oklahoma to the East Coast.
The number of agents and brokers selling personal lines insurance is declining, as direct sales by insurers rise and companies seek to create new relationships with customers, according to PricewaterhouseCoopers.