| Business | Phone |
| Hancock County Bldg Inspection 151 Main St, Bay St Louis 39520 | (228) 467-4157 |
| Hancock County Bookkeeping 152 Main St, Bay St Louis 39520 | (228) 467-6012 |
| Hancock County Chancery Clerk 152 Main St, Bay St Louis 39520 | (228) 467-5404 |
| Hancock County Child Dev Ctr 299 Washington St, Bay St Louis 39520 | (228) 467-8050 |
| Hancock County Circuit Clerk 152 Main St, Bay St Louis 39520 | (228) 467-5265 |
| Hancock County Civic Center Hall Bay St Louis 39520 | (228) 466-6232 |
| Hancock County Co-Op Ext Svc 3064 Longfellow Rd, Bay St Louis 39520 | (228) 467-5456 |
| Hancock County Inventory 149 Main St, Bay St Louis 39520 | (228) 466-2622 |
| Hancock County Marina 5124 Pleasure St, Bay St Louis 39520 | (228) 463-0368 |
| Hancock County Narcotic Task 125 Court St, Bay St Louis 39520 | (228) 467-1496 |
| Hancock County Port & Harbor 706 Highway 90, Bay St Louis 39520 | (228) 467-9231 |
| Hancock County Purchasing 149 Main St, Bay St Louis 39520 | (228) 467-4231 |
| Hancock County Reappraisal 161 Main St, Bay St Louis 39520 | (228) 467-0130 |
| Hancock County Senior Citizens 601 Bookter St, Bay St Louis 39520 | (228) 467-9292 |
| Hancock County Veterans Svc 306 Highway 90, Bay St Louis 39520 | (228) 467-2100 |
| Hancock County Waste Water 3082 Longfellow Rd, Bay St Louis 39520 | (228) 467-6208 |