Bollnäs is a municipality in east central Sweden, in the county of Gävleborg. The municipality covers an area of 1827.1 km². Of the total population of 26735, 13238 are male, and 13497 are female. The population density of the community is 15 inhabitants per km².
... the average family size is 3.47.
In the town the population is spread out with 28.2% under the age of 18, 7.5% from 18 to 24, 33.5% from 25 to 44, 23.9% from 45 to 64, ...