As of 2015, insurance companies that offer multi-car discounts include AAA, Geico, State Farm and Farmers, according to the companies' websites. The amounts and terms of the discounts vary by state, notes Farmers Insurance Company.
Auto policyholders who insure two or more automobiles with AAA Auto Insurance save up to 27.3 percent on automobiles with certain coverage, notes AAA Automobile Club of Southern California. Geico policyholders who insure more than one vehicle receive discounts of up to 25 percent on most of their auto insurance coverage, explains GEICO. State Farm Auto Insurance policyholders who have two or more automobiles insured by related individuals in the same household save up to 20 percent, reports State Farm. Farmers Insurance offers discounts to drivers who own and insure at least two automobiles, according to the company's website.