The city (commune) of Paris has an area of 105.398 km² (40.69 sq. miles, or 26,044 acres). Excluding the outlying parks of Bois de Boulogne and Bois de Vincennes, the actual area of the city is only 86.928 km² (33.56 sq. miles, or 21,480 acres).
This is not a very large area, and in fact the commune of Paris is only the 113th largest commune of France (out of 36,782 communes). For comparison, Greater London has an area of 1,572 km² (607 sq. mi), and New York City has an area of 786 km² (303 sq. miles). This peculiar fact is due to the conservatism of administrative limits in France. Unlike other western metropolises such as London, New York, or Berlin whose limits were extended in the 20th century to include suburbs previously independent, in the case of Paris no such enlargement happened. In fact, the last time Paris was enlarged was in 1860 when Napoleon III and the prefect Haussmann annexed the then suburban communes surrounding Paris, such as Montmartre or Auteuil, extending the area of the city from 34.50 km² (13.3 sq. miles) to 78 km² (30.1 sq. miles), and creating the 20 arrondissements of Paris. Since 1860, the limits of Paris have only marginally changed, reaching the 86.9km² figure indicated above. In 1929, the Bois de Boulogne and Bois de Vincennes were officially incorporated into the city of Paris.
Thus, the Brooklyn, Greenwich, or Charlottenburg of Paris are still lying outside of the city of Paris proper, and the city of Paris can be more rightly compared to the borough of Manhattan (59.5 km²/23 sq. miles) or to Inner London (319 km²/123 sq. miles). Even the largest business and financial district of Paris, known as La Défense, lies outside of the city limits.
The urban area of Paris (unité urbaine de Paris), however, is much more extended than the administrative city of Paris. It had an area of 2,723 km² (1,051.4 sq. miles) in 1999, about 26 times larger than the city of Paris. As for the metropolitan area of Paris (aire urbaine de Paris), its area in 1999 was 14,518 km² (5,605.5 sq. miles), about 138 times larger than the city of Paris.
The city of Paris proper, excluding the outlying Bois de Boulogne and Bois de Vincennes, has an almost regular oval shape, with a circumference of 35.5 km.(22 miles). This oval extends 9.5 km.(6 miles) from north to south, and 11 km.(7 miles) from east to west.