Portland is connected to the rest of Liberty City by a bridge and one underground tunnel. Since Liberty City was based on NYC one can assume that Portland is based on Brooklyn. It is a heavily industrialised area, and also has the presence of Liberty City's docks to the South-East.

Another feature of Portland is its Metro system circles the island which travel on elivated tracks.

Gangs have a large role in Portland. Chinatown is home to the Triads, while the North-East side of the island is Leone Cartel turf.