The term Limousine covers large, luxury cars. So limousines can be for 2 to 4 passengers. Mercedes Benz call all their large cars limousines. They built limousines all the time, either Short or Long wheel base types. In the early 1900's a Mercedes Benz client needed a new limousine to go the races, his wife needed to enter and exit the car with a very large hat, on visiting the factory to see how the car was developing, it was discovered that the door was to small. So a Mercedes-Benz engineer called Binz stretched the limousine to include a bigger door, hence the term "Stretched Limousine". This concept now has many variations. The most obvious type of stretched limousine is the 4 door type. Normally the passenger enters the car by the back door. Inside the seating can be for 4-7 passengers, in this type of limousine, the seats face each other, this a called a "Conference Seated" limousine. Also available are

8 passenger limousines, in this type of limousine the seating is for 3 passengers across the back seat of the car and a long bench seat along the car for 5 passengers, this is called "J Seated". The other type popular in Ireland is the 6 door limousine, In this type of limousine all the passengers and seats face forward, with the centre row of seats being flip up seats, hence it name an "Occasional Seated" Limousine, they are usually shorter then the 4 door type, and are often finished in Black. 

4 Door Conference Seated Limousine

Limousine Styles and Seating design
Interior Styles of Limousines
Conference Seated Limousine

J Seated Limousine

Exterior Styles of Limousines

4 Door J Seated Limousine

6 Door Occasional Seated Limousine