inhabitants, of whom 70% were Swedish speaking. Agriculture was the primary source of income, with 75% of the population making their living from farming. Kauniainen was separated from Espoo in 1920, and it gained city rights the same year as Espoo, in 1972.
Espoo started to grow rapidly in the 1940s and '50s. It quickly developed from a rural municipality into a fully-fledged industrial city, gaining city rights in 1972. Due to its proximity to Helsinki, Espoo soon became popular amongst people working in the capital. In the fifty years from 1950 to 2000, the population of Espoo grew from 22,000 to 210,000. Since 1945, the majority of people in Espoo have been Finnish speaking. In 2006, the Swedish speaking inhabitants represented barely 9% of the total population. The population growth is still continuing, but at a slower rate.
The name Espoo probably comes from the Swedish name for the River Espoo, Espå (or Espåå), which in turn comes from the old Swedish word äspe, meaning a border of aspen, and the Swedish word for "river", å, thus "a river bordered by aspen". The name was first mentioned in 1431
