South Western Surveying Ltd also serves Ailsa Craig, Amherstburg, Aylmer, Belle River, Blenheim, Caledonia, Chatham, Delhi, Dresden, Dunnville, Essex, Glencoe, Grand Bend, Hagersville, Ingersoll, Kingsville, Leamington, London, Lucan, Mount Brydges, Petrolia, Port Dover, Port Rowan, Ridgetown, Rodney, Sarnia, Simcoe, St. Thomas, Strathroy, Tavistock, Tilbury, Tillsonburg, Wallaceburg, Windsor, Woodstock and Wyoming