| Business | Phone |
| D D Family Specialized Unit 2875 Henry St, Port Huron 48060 | (810) 987-2926 |
| Day Treatment Night Watch 2706 10th Ave, Port Huron 48060 | (810) 985-5390 |
| Honorable Daniel J Kelly 201 Mcmorran Blvd 306, Port Huron 48060 | (810) 985-2060 |
| Honorable James P Adair 201 Mcmorran Blvd 3200, Port Huron 48060 | (810) 985-2040 |
| Honorable Peter E Deegan 201 Mcmorran Blvd 3500, Port Huron 48060 | (810) 985-2050 |
| Michigan Works 100 Mcmorran Blvd, Port Huron 48060 | (810) 966-3300 |
| Port Huron Counseling Ctr 1007 Military St, Port Huron 48060 | (810) 987-7050 |
| St Clair Cnty Lands & Graphics 200 Grand River Ave # 105, Port Huron 48060 | (810) 989-6920 |
| St Clair Cnty Probate Ct-Jvnl 201 Mcmorran Blvd 2108, Port Huron 48060 | (810) 985-2155 |
| St Clair Cnty Public Guardian 201 Mcmorran Blvd 1500, Port Huron 48060 | (810) 985-2095 |
| St Clair County Controller 200 Grand River Ave, Port Huron 48060 | (810) 989-6900 |
| St Clair County Adult Prbtn 201 Mcmorran Blvd # 308, Port Huron 48060 | (810) 985-2020 |
| St Clair Cnty Animal Shelter 3378 Griswold Rd, Port Huron 48060 | (810) 984-3155 |
| Michigan State University Ext 200 Grand River Ave 102, Port Huron 48060 | (810) 989-6935 |
| St Clair Cnty Information Tech 201 Mcmorran Blvd, Port Huron 48060 | (810) 985-2262 |
| St Clair County Detectives Bur 1170 Michigan Rd, Port Huron 48060 | (810) 987-1730 |
| St Clair County Employment 200 Grand River Ave, Port Huron 48060 | (810) 987-9170 |
| St Clair County Equalization 200 Grand River Ave 105, Port Huron 48060 | (810) 989-6925 |
| St Clair County Family Plan 3415 28th St, Port Huron 48060 | (810) 987-6108 |
| St Clair County Friend-The Ct 201 Mcmorran Blvd 1600, Port Huron 48060 | (810) 985-2285 |
| St Clair County Infant Support 3415 28th St, Port Huron 48060 | (810) 987-5401 |
| St Clair County Maintenance 201 Mcmorran Blvd, Port Huron 48060 | (810) 985-2231 |
| St Clair County Med Examiner 3415 28th St, Port Huron 48060 | (810) 982-4111 |
| St Clair County Metro Planning 200 Grand River Ave 202, Port Huron 48060 | (810) 989-6950 |
| St Clair County Office 201 Mcmorran Blvd, Port Huron 48060 | (810) 966-9514 |
| St Clair County Offices 200 Grand River Ave, Port Huron 48060 | (810) 985-4795 |
| St Clair County Personnel 200 Grand River Ave # 203, Port Huron 48060 | (810) 989-6910 |
| St Clair County Records' Office 204 Bard St, Port Huron 48060 | (810) 987-1740 |
| St Clair County Register-Deeds 200 Grand River Ave 103, Port Huron 48060 | (810) 989-6930 |
| St Clair County Surveyor 200 Grand River Ave, Port Huron 48060 | (810) 989-6307 |
| St Clair County Teen Health 2215 Court St, Port Huron 48060 | (810) 987-1311 |
| St Clair County Veteran's 200 Grand River Ave 104, Port Huron 48060 | (810) 989-6945 |
| St Clair Juvenile Detention 1170 Michigan Rd, Port Huron 48060 | (810) 984-3896 |