The "Orange Card" is a Paris transportation pass, valid for either one
week or one month for the zones of coverage you can choose.

Carte Orange, meant mostly for citizens of Paris, is generally a much
better value than the transportation pass called the Paris Visite,
meant for tourists.

Carte Orange quick facts

* You cannot buy one outside of Paris. You will need to purchase on
from an RAPT agent at any Metro or RER station in Paris.

* Despite what you will might hear about the pass being available
only to Parisians, anyone can buy a Carte Orange.

* The weekly pass (called a coupon hebdomadaire) is valid Monday to
Sunday only. Be sure you can communicate the dates that you want, or
that you'd like a Carte Orange for the next week starting Monday.
Otherwise you may be sold a pass that is only valid for the rest of the
week.

Coupon hebdomadaire : Validité du lundi au dimanche uniquement

Il peut être acheté jusqu'au mercredi pour la semaine en cours, et à
partir du vendredi pour la semaine suivante (pas de vente de coupon
hebdomadaire le jeudi).

Trans:-

You can buy it up to Wednesday for use in the current week, and from
Friday for use the next week. (No weekly passes sold on Thursdays)

* The monthly pass (called a coupon mensuel) is valid for the
calender month.

* You will need to specify the zones you wish to travel in. Zones
one and two are central Paris, and quite likely the only two you'll be
interested in for a pass. If you need to go outside those zones only
once (to Versailles, for example) a separate ticket will be cheaper
than extending you pass to those zones. (See the link to the zone map
(pdf) below.

* You will need a small, passport style photo to attach to the pass
(about 1 1/8" in height). You can buy one at the metro station.

* The Carte Orange passes are valid for unlimited rides on the RATP
system.

* Prices for a weekly zone 1-2 weekly Carte Orange in 2004 was
€14.50.