| Business | Phone |
| Mattawa Tourist Information 401 Pine St, Mattawa P0H 1V0 | (705) 744-0222 |
| Mattawa Arena Mike Rodden 450 Hurdman St, Mattawa P0H 1V0 | (705) 744-2311 |
| Mattawa Greffier-Tresorier 160 Rue Water, Mattawa P0H 1V0 | (705) 744-5611 |
| Mattawa Travaux Publics Mill, Mattawa P0H 1V0 | (705) 744-2424 |
| Nipissing District Social Svc 150 Water St, Mattawa P0H 1V0 | (705) 744-0395 |
| Papineau-Cameron Twp Garage 4861 Highway 17 W, Mattawa P0H 1V0 | (705) 744-5072 |
| Papineau Office 4816 Highway 17 W, Mattawa P0H 1V0 | (705) 744-5610 |
| Calvin Office Rr 1, Mattawa P0H 1V0 | (705) 744-2700 |
| Calvin Twp Garage Rr 1, Mattawa P0H 1V0 | (705) 744-2210 |