With the holidays brings closures of city and county offices. Non-emergency offices at the Marion County Courthouse will close at noon Thursday and remain closed on Friday, Knoxville City Hall will be closed Christmas Day, and the Knoxville Library will close at 2:00 Thursday and be closed all day Christmas Day and remain closed through Saturday. The Knoxville Post Office will be open regular hours Thursday, but will be closed with no mail delivery on Christmas.