Most Americans believe they'll need to save up at least $1 million to retire comfortably. But depending on where you plan to spend your post-work years, that may or may not be enough money to sustain you.

If you plan on retiring in the United States, it's helpful to get an idea of how far you'll be able to stretch your retirement funds in different states. Retirement can often last 25 years or more, according to Fidelity, but in states with high costs of living, $1 million may not be enough to cover your expenses for that long.