1) Busy 2) Colonized 3) Engaged 4) Filled 5) Having tenants 6) Held or filled or in use 7) In use 8) Inhabited 9) Peopled 10) Populated 11) Resided in 12) Settled Found on https://www.crosswordclues.com/clue/occupied
adjective having ones attention or mind or energy engaged; `she keeps herself fully occupied with volunteer activities`; `deeply engaged in conversation` Found on https://www.encyclo.co.uk/local/20974