Google vintage and antique stores. This is a national forum, but for the most part, they aren't hard to find, particularly in more rural counties.

Auction houses. MD has a few that turn out plenty of antique furniture. Start with the ones that list on Hibid if you are not familiar with any.

Search on Instagram too…Maryland antiques…there are a good number of vendors selling antiques that don’t have a storefront or do popups, etc.