Refuser,
Generally the age cut off which I see is 18 rather than 21. That being said I would follow Carlotta's advice and google for Oxford House. There are hundreds if not thousands of Oxford Houses in the US -- even my tiny state of Delaware has 61 Oxford Houses spread among our 3 counties.
If you are looking to relocate - south east Florida is a great place to find sober living houses - try Delray Beach, West Palm Beach and Fort Lauderdale for starters.
Jim