The English port city of Portsmouth has a wide variety of places of worship representing many Christian denominations and other faith groups. As of 2021, there were 100 in the city: 75 churches, chapels, halls and meeting rooms for various Christian groups, three mosques, a synagogue and a gurdwara were in use, and a further 20 buildings no longer serve a religious function but survive in alternative uses. Portsmouth is in the southeast of the traditional and ceremonial county of Hampshire, although it is now administered as a separate unitary authority; it spreads across the whole of Portsea Island and on to the mainland to the north, and is the most densely populated city in the United Kingdom. The city area is wholly urban, but most of its growth occurred between the 18th and 20th centu