| Business | Phone |
| Ontario Property Assessment 132 2nd St E, Cornwall K6H 1Y4 | (613) 933-7100 |
| Ontari Entretien 1916 Pitt, Cornwall | (613) 938-3307 |
| Ontario Housing Dept 1916 Pitt St, Cornwall K6J 5H3 | (613) 938-7717 |
| Restoring Balance Cornwall Island, Cornwall K6H 5R7 | (613) 937-4917 |
| St-Regis Adult Education Po Box 579 Stn Main, Cornwall K6H 5T3 | (613) 575-2754 |
| Stormont Dunas & Glengarry Ofc 26 Pitt St, Cornwall K6J 3P2 | (613) 933-4301 |
| Turtle Island Coffee Rr 3 Lcd 1, Cornwall K6H 5R7 | (613) 933-8975 |
| Cornwall Richelieu Day Care 305 York St, Cornwall K6J 3Z4 | (613) 933-5730 |
| Cornwall Service D'Incendie 10 4th St W, Cornwall K6J 2R6 | (613) 932-2025 |
| Cornwall Social Svc 400 St Felix St, Cornwall K6H 5A8 | (613) 933-6282 |
| Cornwall By-Law Enforcement 360 Pitt St, Cornwall K6J 3P9 | (613) 932-5241 |
| Cornwall Centre Commemoratif 504 4th St E, Cornwall K6H 2J8 | (613) 932-4422 |
| Cornwall Commerce 360 Pitt St, Cornwall K6J 3P9 | (613) 932-6252 |
| Cornwall Centre Sportif 229 Water St E, Cornwall K6H 1A2 | (613) 932-8682 |
| Cornwall Marina 200 Water St E, Cornwall K6H 1A3 | (613) 932-8301 |
| Cornwall Hotel De Ville 306 Pitt St, Cornwall K6J 3P9 | (613) 930-6252 |
| Cornwall Dev Economique 100 Water St E, Cornwall K6H 6G4 | (613) 933-0074 |
| Cornwall Public Works 1225 Ontario St, Cornwall K6H 4E1 | (613) 932-5354 |
| Cornwall Civic Complex 100 Water St E, Cornwall K6H 6G4 | (613) 938-9400 |
| Cornwall Environmental Svc 861 2nd St W, Cornwall K6J 1H5 | (613) 937-1777 |
| Cornwall Building Inspections 340 Pitt St, Cornwall K6J 3P9 | (613) 933-7818 |
| Cornwall Water Filtration 861 2nd St W, Cornwall K6J 1H5 | (613) 932-2235 |
| Cornwall Transport En Commun 863 2nd St W, Cornwall K6J 1H5 | (613) 930-2636 |
| Cornwall Usine D'Epuration Des 2800 Montreal Rd, Cornwall | (613) 933-5157 |
| Cornwall King George Park 125 7th St E, Cornwall K6H 2R2 | (613) 932-0741 |
| Cornwall Landfill Site Cornwall Centre Rd, Cornwall | (613) 933-6953 |
| Cornwall Island Day Care Rr 3 Lcd 1, Cornwall K6H 5R7 | (613) 938-5067 |