Yes, there are a few states that allow residents to play at online casinos, including:
Virginia (as of Jan 2021)
Maryland (in 2021)
Arizona (late 2021)
There are a few other states that are considering legalizing online gambling in some form. Those states include:
California, which has been trying to pass online poker for years and sports betting is now in talks.
New York, which is soon to get online sports betting.
Massachusetts, which has introduced a few pieces of legislation that would bring online gambling there.
Connecticut, where lawmakers are reviewing proposals for sports betting to be launched in 2021 or 2022.
Ohio, where the state’s first online sports betting legislation, which could bring sports betting to this midwest state in January 2022, is under review.