| Business | Phone |
| Carlstadt Borough Clerk 500 Madison St, Carlstadt 7072 | (201) 939-2850 |
| Carlstadt Building Inspector 500 Madison St, Carlstadt 7072 | (201) 939-1777 |
| Carlstadt Sewerage Authority 429 Hackensack St, Carlstadt 7072 | (201) 935-3240 |
| Sewage Authority Pump Station Jony Dr, Carlstadt 7072 | (201) 935-3240 |