Use a nationwide directory like MyMedicareBroker.com to search for a broker by...

https://www.cool-bookmarks.win/choosing-a-medicare-broker-is-easier-when-you-can-compare-options-in-one-place-1

Use a nationwide directory like MyMedicareBroker.com to search for a broker by state or county. Verify the broker’s NPN and ask what they cover: Medicare Supplement, Medicare Advantage, and Part D offerings can vary.