Who Is The Largest Auto Insurance Company In The USA? 
Currently , the largest US auto insurance company is State Farm , assuming we use written premiums as the criteria . State Farm has offices throughout the US . Following State Farm is Warren Buffet 's Berkshire Hathaway -LRB- Geico and other companies -RRB- , Allstate , Progressive , Farmers and USAA . Of course , these rankings change fairly often . In fact , Berkshire just recently passed Allstate for the Number 2 position . Many local companies in your area may not be the biggest carriers , but still write a lot of local business . LIVE answer provided by : Ed Harris - Premier car insurance broker since 1980 and owner of several top-rated websites that offer the lowest available rates . 