The city of Paris is divided into 20 arrondissements municipaux (also called "municipal boroughs") that surround the Seine. The number of the arrondissement is indicated in Parisian postal codes by the last two digits. The 20 arrondissements are arranged in the form of a clockwise spiral, starting with the 1st, 2nd, 3rd, and 4th in the heart of Paris. The 5th, 6th, 7th are well-known as tendency and cultural places. The 8th and 9th are business and shops (Champs Elysees and big stores) and the rest of the arrondissements are residential areas.
The 1st arrondissement is very small, with a land area of only 1.826 km² (0.705 sq. miles, or 451 acres). It is the least-populated of the arrondissements, though it is also one of the smallest by land area. Much of the arrondissement is used for business and administration. It is one of the oldest arrondissements in Paris. A significant part of the arrondissement harbors the Louvre and the Tuileries Gardens.
The 2nd arrondissement is called Bourse. It has an area of 0.992 km² and the population is 19.585.
The 3rd arrondissement is called Temple. It has an area of 1.171 km² and the population is 34.248.
The 4th arrondissement is called Hôtel-de-Ville. It has an area of 1.601 km² and the population is 30.675.
The first four arrondissements are not neighbourhoods. In fact they are advocated more to business and tourism
The 5th arrondissement is called Panteon. It has an area of 2.541 km² and the population is 59.300. It is the most antique neighborhood of Paris built up by the Romans. It is located on the Left Bank.
The 6th arrondissement is called Luxembourg. It has an area of 2.154 km² and the population is 45.800. It is an expensive arrondissement but there are many shops and night clubs.
The 7th arrondissement is called Palais-Bourbon. It has an area of 4.088 km² and the population is 55.700. It is one of the richest districts of the city and there are practically no shops or night clubs. It contains a number of French national institutions. Among these are the French National Assembly and numerous French ministries. The 7th arrondissement is also a major tourist destination, containing the Eiffel Tower and the Hôtel des Invalides, which is the burial site of Napoleon.
The 8th arrondissement is called Hélice. It has an area of 3.881 km² and the population is 39.200. It is one of the most exclusive residential areas.
The 9th arrondissement is called Opera. It has an area of 2.179 km² and the population is 58.800. It contains many places of interest, including the Boulevard Haussmann and its large department stores. The traffic is heavy during the day but not that much during the night.
The 10th arrondissement is called Enclos-St-Laurent. It has an area of 2.892 km² and the population is 89.600.
The 11th arrondissement is called Popincourt. It has an area of 3.666 km² and the population is 150.500.
The 12ve arrondissement is called Reuilly. It has an area of 6.377 km² and the population is 139.100.
Districts 10, 11 and 12 are typical neighborhoods of Paris with small shops and stylish buildings. Due to rehabilitation these districts are constantly changing.
The 13th arrondissement is called Gobelins. It has an area of 7.146 km² and the population is 177.900. Some parts are suburbia and some others are shopping areas, but it is not very touristy. The 13th arrondissement hosts the Bibliothèque François Mitterrand and the Chinatown.
Different cultures and religions are part of the 13th arrondissement.
The 14th arrondissement is called Observatoire. It has an area of 5.621 km² and the population is 134.200. It is a nice neighbourhood; almost every block is only five minutes away from a subway or a RER. It is also very peaceful, there are excellent restaurants and a big park called Montparnasse. There are markets everywhere and it has easy connections with airports. This district also contains the Cité Internationale Universitaire de Paris, which is located near Parc Montsouris and Stade Charléty.
The 15th arrondissement is called Vaugirard. It has an area of 8.502 km² and the population is 231.500. It is the biggest one in Paris except from 12 and 15 due to the presence of the bois. This district is characterized by having many supermarkets and not too many night clubs.
The 16th arrondissement is called Passy. It has an area of 7.846 km² and the population is 146.900. It is very peaceful residential area. This district is the most elegant, most of the theater and cinema’s stars live there. Embassies are located there.
The 17th arrondissement is called Batignolles-Monceau. It has an area of 5.699 km² and the population is 160.300. This arrondissement hosts two very active areas: in the northern part, the working-class area around Place de Clichy is an extension of the Pigalle red-light district; in the southern part, the upper-class area around Avenue des ternes, where the Marché Poncelet is located, is more Haussmannian in style. That means that you might find variety of things in only one place.
The 18th arrondissement is called Butte-Montnarte. It has an area of 6.005 km² and the population is 188.500.
The 19th arrondissement is called Buttes-Chaumont. It has an area of 6.786 km² and the population is 185.400.
The 20th arrondissement is called Menilmontant. It has an area of 5.984 km²and the population is 188.600.
The 18th, 19th and 20th arrondissement are pretty old districts with beautiful gardens and also many places of interest.