| Business | Phone |
| Johnston Building Inspector Johnston 2919 | (401) 231-4158 |
| Johnston Building Maintenance 100 Irons Ave, Johnston 2919 | (401) 231-4277 |
| Johnston Building Official 100 Irons Ave, Johnston 2919 | (401) 231-4163 |
| Johnston Fleet Maintenance 100 Irons Ave, Johnston 2919 | (401) 231-4190 |
| Johnston Housing Inspector Johnston 2919 | (401) 231-4161 |
| Johnston Permits Dept 100 Irons Ave, Johnston 2919 | (401) 231-4117 |
| Johnston Sewer Dept 1385 Hartford Ave, Johnston 2919 | (401) 351-1760 |
| Johnston Town Engineer Johnston 2919 | (401) 231-4065 |
| Softball Field 10 Memorial Ave, Johnston 2919 | (401) 231-9783 |
| Rainone Gymnasium 45 Mill St, Johnston 2919 | (401) 942-9505 |
| Providence Pumping Station 60 Ashby St, Johnston 2919 | (401) 944-0479 |