Foreigners accounted for almost two-thirds of the increase as the number of non-Swiss residents increased by 60,700, the FSO said in a report released on Thursday.
The number of foreign citizens living permanently in the country rose to almost two million, accounting for 24.3 percent of the population, the report said.
The average age of foreign residents was 37, compared to 43 for Swiss nationals.
The figures show that overall, the Swiss population is aging with the number of people aged 100 and over more than doubling to 1,600 in 2014 from 787 in 2000.
The country’s oldest residents are overwhelmingly female, with 1,300 women centenarians and 300 male counterparts.
One in five women and one in six men were over the age of 64.
Population growth was registered last year in all of the country’s 26 cantons but Fribourg (up 1.9 percent) marked the biggest increase, ahead of Geneva and Zug (1.7 percent each).