 Port of Spain continued to grow in size and importance during the 19th and early 20th centuries, peaking in size in the 1960s at about 100,000 people.Since then the population within the city limits has declined in size as the downtown area has become increasingly commercial and the suburbs in the valleys north, west, and north-east of the city have grown.Today Port of Spain is the western hub of a metropolitan area stretching from Carenage, west of the city, to Arima, east; this East–West Corridor runs along the southern edge of Trinidad's Northern Range.