The agency voted in favor of the service restoration on Tuesday. Officials say they relied on customer comments and studies to determine the 42 lines that will be restored starting on Sept. 4.
Customers have complained about longer wait times and overcrowded buses since the agency voted to reduce service by 10 percent in February.
The cuts were designed to save the cash-strapped agency $28 million a year.
Restoring service will cost about $11 million. The money is coming from grants and tax revenue, including about $4 million approved by the Metropolitan Transportation Commission.