- "In transit since 1922"
The company operates its depot on the corner of Tangerine Street and Mirror Park Boulevard in East Vinewood, Los Santos. In the game, each protagonist has the number of the company and can call for a cab to pick them up. It is based on LA Checker Cab Co. in Los Angeles.
The Downtown Cab Co. can be purchased by Franklin for $200,000 after completing the mission Friends Reunited. The Downtown Cab Co. generates $2,000 per week after the initial purchase and all cab rides are free for Franklin, and as such, he can no longer earn himself a wanted level for not paying the driver, but Michael and Trevor still have to pay theirs and can earn a wanted level for not paying the driver. Franklin can also do Private Taxi Fare missions after the purchase, he will receive calls from the manager of the company, Raul, asking him if he can deliver a passenger across the town.
Downtown Cab Co. uses Vapid Stanier cars painted in the company's livery as the service vehicle for all fares. The company's taxis can be seen operating across Los Santos. If the player calls for a cab in Blaine County a cab will come unless they are in an inaccessible area. There is usually a high density of taxi traffic in the L.S.I.A. area, as well as Downtown Vinewood and Strawberry. The firm appears to be a large business due to the fact that it is the only taxi company operating in the game, and they have no competitors. The fact that the company has only one depot indicates that a majority of its taxis are on the road at all times.
- Their phone numbers start with 323. 323 is an actual Greater Los Angeles area code. Dialing the number manually (i.e. using the handset's keypad) is the same as selecting Downtown Cab Co. from the list of contacts.
- Exactly where the cabs will take the characters varies. For example, it is not possible to order a cab ride to the top of Mount Chiliad. When the driver reaches the extent of how far he is able to go, he'll drop the character off.
- If the player places a waypoint into the middle of the ocean, and skips the trip, the taxi will spawn above the ocean water.
- Strangely, when Franklin calls for a cab after purchasing it, the dispatcher Raul will not call him boss. This is likely because all protagonists have the same numbers, thus using the same voice and dialogues.
- After the purchase of the company, Franklin can take the taxis from the depot freely, although he is still using a carjacking animation. Most likely an oversight.