Mermentau Branch Mailing Address PO Box 369 Mermentau, LA 70556 Physical Address 107 Second St. Mermentau, LA 70556 Phone: 337-824-0690 HOURS OF OPERATION Tuesday & Thursday 1:00 PM – 5:00 PM Get Directions From To Add Waypoint For Driving Walking Transit Bicycling show options hide options Avoid Tolls Avoid Highways Avoid Ferries Print directions Reset directions Fetching directions...... Reset directions Print directions