English: Remains in the Greco-Roman Jerash include:

• The Corinthium column
• Hadrian's Arch
• The circus/hippodrome
• The two large temples (dedicated to Zeus and Artemis)
• The nearly unique oval Forum, which is surrounded by a fine colonnade,
• The long colonnaded street or cardo
• Two theatres (the Large South Theatre and smaller North Theatre)
• Two baths, and a scattering of small temples
• An almost complete circuit of city walls.

Most of these monuments were built by donations of the city's wealthy citizens.

From AD 350, a large Christian community lived in Jerash, and between AD 400-600, more than thirteen churches were built, many with superb mosaic floors. A cathedral was built in the 4th century. An ancient synagogue with detailed mosaics, including the story of Noah, was found beneath a church.