Parking at Kettering General Hospital generated a total of £672,129 in 2012-13.
The figure for the amount raised was released under a Freedom of Information Act request.
Car parking payments from visitors at the hospital in Rothwell Road raised £448,547 for the trust.
Staff car parking generated a total of £223,582.
Parking charges at the hospital during 2012-13 were about £2.50 for up to two hours, £3.80 for two to four hours and £6.20 for up to 24 hours.