Longman Dictionary of Contemporary English
Wikipedia
Most countries have many sorting offices; the USPS has about 275. Some small states such as Tahiti have only one. The UK and USA have also used Post Office Sorting Vans at various times; the last UK services were in 2004. Currently, Germany has about 95-98 sorting offices across the country.
The United Kingdom Royal Mail's Mount Pleasant Sorting Office was the world's largest sorting office at the beginning of the 20th century but is now only the largest one in London.
Military mail systems, such as the British Forces Post Office and U.S. Military Postal Service, have their own dedicated sorting offices.
Usage examples of "sorting office".
Two candle lanterns glowed in the velvet, papery darkness of the main sorting office.
Blue light glowed from within the sorting office, and a radio played soft big band music which jarred against the music and laughter from the general's garden.
Now it was in the postman's grey sack, now at the sorting office, now on the train.
Early the next morning John and Jim sat in the Brentford Sorting Office viewing the twenty-three sacks of application forms which had all arrived by return of post.
So it was, two hours later, that we located two immense crates addressed to me, waiting safely in the dead-letter section of the Mount Pleasant Sorting Office.
He breathed deeply as he thought about it, passing postal workers from the Mount Pleasant sorting office standing talking just outside a small cafe.
Graham smiled and crossed the road to the sorting office, smelling its new coat of paint.
Ridcully opened the tap marked 'Spray' and leapt aside, because part of him was still well aware that Johnson's inventiveness didn't just push the edge of the envelope but often went across the room and out through the wall of the sorting office.
The postmen at the sorting office who try to lose as many of the letters addressed to Gestapo Headquarters as possible.
He made a selection of the letters in his room, parcelled up those he didn't need to keep, and headed off back to the Sorting Office.