Nearly a quarter of retired married couples and more than 40 percent of elderly single people rely on Social Security benefits almost exclusively for their income, according to the Social Security Administration.

Hopefully, those people have chosen to call one of the following counties home. The website SmartAsset analyzed average Social Security benefits, the cost-of-living and tax rates for 3,133 U.S. counties. Then, it assigned an index rating to each one to represent how easy it would be to live there off Social Security alone. Higher index numbers mean your Social Security benefits would go further.

San Francisco came in dead last, so don’t move there if you won’t have any income beyond Social Security. Instead, consider one of these 25 counties, ranked from least to most affordable for your retirement dollar.