The post office had confirmed plans to move some mail processing operations out of Huntsville.
The U.S. Postal Service announced a plan Tuesday to consolidate operations. The plan called for moving some mail processing operations to Birmingham.
The changeover will be completed by January.
Postal officials said some Huntsville employees may also be reassigned to Birmingham.
Officials said a big drop in mail volume made these changes necessary. Residents will not see any change in the way mail is delivered to their home.