The John W. Olver Transit Center, also called the JWO Transit Center, is an intermodal transit hub for Franklin County, Massachusetts. Located in Greenfield, it currently serves Franklin Regional Transit Authority (FRTA) local bus routes plus intercity bus service. Amtrak's Greenfield station is also located here, with one daily Vermonter round trip and two daily Valley Flyer round trips, which are extensions of Amtrak-run Hartford Line trains.

Greenfield is the only city in, and the seat of, Franklin County, Massachusetts, United States. Greenfield was first settled in 1686. The population was 17,768 at the 2020 census. Greenfield is home to Greenfield Community College, the Pioneer Valley Symphony Orchestra, and the Franklin County Fair. The city has a Main Street Historic District containing fine examples of Federal, Greek Revival, and Victorian architecture.