Is it state capital or capitol?

When you are talking about the principal city in a state, then the word you want is capital (e.g., “Providence is the capital of Rhode Island”). The building in the capital city where the legislature meets is the capitol (e.g., “Alaska’s capitol in Juneau is rather underwhelming”).

In Washington, D.C., the US Capitol is given an uppercase “C.”

Use QuillBot’s free grammar checker to ensure you use capital or capitol correctly!