St. Helier is one of the twelve parishes of Jersey, the largest of the Channel Islands in the English Channel. St Helier has a population of about 33,500, roughly 34.2% of the total population of Jersey, and is the capital of the island (although Government House is situated in St Saviour).

The Town of St. Helier (commonly referred to by locals as just "town") is the largest settlement and only town of Jersey. The town consists of the built-up areas of St Helier, including First Tower, and parts of the parishes of St Saviour and St Clement, with further suburbs in surrounding parishes. The greater part of St Helier is rural.

The parish covers a surface area of 4.1 square miles, being 9% of the total land area of the island (this includes reclaimed land area of 494 acres or 200 ha).

The parish arms are two crossed gold axes on a blue background, the blue symbolising the sea, and the axes symbolising the martyrdom of Helier at the hands of Saxon pirates in 555 AD.

Landmarks include: Many places in St Helier have been formally listed as Sites of Special Interest by the Planning and Environment department of Jersey.[24]

• Fort Regent is located at the top of the Mont de la Ville. It was initially constructed as a barracks at the end of the Napoleonic Wars. It was decided to develop it into a leisure complex in 1967. There was a cable car that gave access to Fort Regent from Snow Hill, however, it was closed in 1991. There used to be a swimming pool which opened in 1971 however was knocked down in 2020.
• A tunnel (A17) was opened under the Fort on 25 February 1970 after seven years of construction. The tunnel links traffic from the east to the west of the island, and allowed for the pedestrianisation of the town centre.
• Central Market, in Beresford Street, St Helier, is an indoor market which was opened in 1882. It is an official Site of Special Interest, and is popular with tourists and locals. It features Victorian architecture including cast iron structures, and an ornamental fountain in the centre. The market was designed by Thomas Helliwell of Brighouse, Yorkshire, working with Bellamy and Hardy of Lincoln. The market comprises stalls selling flowers, fruit and vegetables, as well as small shops and cafés.
• Beresford Market is a separate building next to the Central Market and specialises in fishmongery.
• 16 New Street is an 18th-century Georgian townhouse, with some 19th century additions, which has been renovated by the National Trust for Jersey, and is now operated as a museum.