9. South Dakota: The Financial Haven

For the fiercely independent single retiree who wants maximum financial efficiency, South Dakota offers an unbeatable economic environment. The state has no income tax, no inheritance tax, and no estate tax. The cost of living falls well below the national average, making it an ideal base for retirees stretching a limited fixed income.

South Dakota serves as a highly popular domicile for single retirees who spend part of their year traveling in an RV. Even if you plant roots permanently, cities like Sioux Falls and Rapid City offer excellent healthcare infrastructure—frequently ranking high for healthcare access per capita. The community culture heavily emphasizes neighborliness, making it welcoming for newcomers arriving on their own.