Post office in Calvin (LA) Find any Post office in Calvin, LA. Addresses, phone numbers, working hours and other information. Quick go: All categories of companies Church Establishment Finance General contractor Library Local government office Place of worship Post office Calvin Postal Service Establishment, Finance, Post office 279 3rd St, Calvin, LA 32500 318-727-9386 postofficeshours.com Categories of companies All categories Church Establishment Finance General contractor Library Local government office Place of worship Post office