Are some grocery stores region specific?

By this I mean, are some grocery stores only located in certain states? When I lived in Indiana, and in the town I lived in, there was only Super Walmart and K Mart to shop at.

I never heard of Trader Joe’s, Costco or Smith’s until I moved to California.

Then I moved to the Silver State and Winco opened up right near where I live and I never heard of that store, either.

I never heard of Waldbaum’s until I watched the show Everybody Loves Raymond and King of Queens. Waldbaum’s must only be in New York, since that show and King of Queens is set in NY?