The Collaborative International Dictionary of English v.0.48:

Dweller \Dwell"er\, n.
   An inhabitant; a resident; as, a cave dweller. "Dwellers at
   Jerusalem." --Acts i. 19.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dweller
    n 1: a person who inhabits a particular place [syn:
         inhabitant, habitant, dweller, denizen,
         indweller]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "dweller":
   addressee, artist-in-residence, denizen, habitant, house detective,
   incumbent, inhabitant, inhabiter, inmate, inpatient, intern,
   live-in maid, liver, locum tenens, occupant, occupier, residencer,
   resident, resident physician, residentiary, resider, sojourner,
   tenant