Contrary to popular belief, there are more than 3 times as many cities in IV than SA. (Thank Alderney for that)
It's all one Liberty City. You shouldn't treat each big neighbourhood as a city of it's own.
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The GTA Wiki begs to differ. I believe the category for each says "City". Alderney is classed as a State, with it's respective cities. Judging by each district's inspiration, and since Alderney is a State, each location is a City. However, they are rather small. But isn't Davis smaller in V, and that's a city?
Each city is also based on one or many cities in NJ.
http://gta.wikia.com/wiki/Leftwood(Englewood, Ironbound, and Westwood)
http://gta.wikia.com...i/Alderney_City(Jersey City, Trenton, and Newark)
http://gta.wikia.com/wiki/Normandy(Military Ocean Terminal)
http://gta.wikia.com/wiki/Berchem(Hoboken and North Bergen)
Add Liberty City (NYC) to this, and you have 10 cities.
I know that many people never notice this, but the game doesn't really tell you out loud. You have to do some digging to find this out.
Differences between the State of Alderney and Liberty City:
Alderney has a state house in Alderney City.
The State of Alderney has it's own police force (http://gta.wikia.com...ey_State_Police) and it's own state prison (http://gta.wikia.com/wiki/Alderney_State_Correctional_Facility) with a respective Department of Corrections. (http://gta.wikia.com/wiki/Alderney_State_Department_of_Corrections).
LTA transit does not operate within Alderney, as it is not part of Liberty City State.
However, the state of Alderney has it's fair share of developer oversights.
The FDLC operates stations within Alderney. However, in real life, fire departments in NJ frequently call the FDNY for mutual aid, so the FDNY can operate in NJ at times, although it does not have stations within the state.
The ASP use LCPD vehicles. This is a developer oversight. The ASP, however, have their own uniforms with the ASP emblem, and their own quotes in which they identify themselves as State Troopers instead of LCPD.
Alderney also uses "Liberty city state" license plates, which is another developer oversight.
Other things that can cause misconception, but make sense.
Liberty City Cabs operate within Alderney, however, as a private company, they can operate wherever they please.
MS Paramedic operates within Alderney as well, however they are a private ambulance company, so the local hospitals contract with them.
LSD operates within Alderney as well, probably due to contracting, as Alderney and Algonquin (LC) have junkyards/terminals.