RATP operates the majority of buses in
Paris , and a significant number of lines in its suburbs. Other suburban lines are operated by private operators grouped in a consortium known as
Optile (''Organisation professionnelle des transports d'Île-de-France'').
Bus services which are operated mainly in the city proper of Paris are named with two-digit numbers. Bus services which are operated mainly in the suburbs are named with three-digit numbers.
RATP uses the numbers 20-96 for lines operated mainly in the city proper. The first number represents the terminal:
The second number represents the outermost arrondissement:
The RATP operates 59 bus lines within the city proper, and 205 bus lines in Paris suburbs. In 2004, 953.6 million journeys were made on RATP bus lines, including 352.2 million journeys on Paris lines and 601.4 million journeys on suburbs lines.
The table below shows routes of RATP lines which are mainly operated within the city proper:
!Number
!Routing
