Relatively few people make it to the North Gate, with most turning off at either Temple of Artemis or at the very latest the North Theatre. For those who do, the North Gate was built in the early 2nd Century AD on orders of Claudius Severus. The North Gate did, in a way, feel a little bit more genuine than the South Gate, not having been restored to the same extent. In my opinion, it does quite well in taking pictures, too, with the Cardo Maximus leading up to it.
These are among the newest buildings in the Jerash archaeological zone, but when saying newest what I really mean is 7th-8th Centuries, which was still well after the decline of the Roman Jerash. The ruins are at the junction of the Cardo Maximus and the Decumanus.
Most visitors to Jerash stick to the archaeological site and completely ignore the modern town on the other side of the river. Unfortunately, due to time constraints, I had to do the same, but this did not stop me from making a quick tour by car (we had rented our own car). While it is typical of modern Middle Eastern towns, Jerash does have a few ruins to explore (e.g., the Eastern Baths, the Roman walls, and a few other structures) and it offers great views over the archaeological site itself. Attached are a few photos from modern Jerash.