NEW CASTLE — The U.S. Postal Service may close a Western Pennsylvania mail processing center with 200 workers and move the work to Pittsburgh.

Postal spokesman Tad Kelley says officials will take months to study closing the facility in New Castle. The center handles about 1.8 million pieces of mail daily but much of that is bulk material like catalogs that might better be handled at a bulk mail facility north of Pittsburgh.

The rest could be handled at a 24-hour mail processing center in Pittsburgh staffed by 900 workers. The Pittsburgh facility opened in 1982 and includes administrative offices with another 100 workers.

Union officials say they oppose closing the New Castle operation.