Kriens has a population (as of ) of . , 15.8% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 6.3%.
Population growth The population of Kriens has grown constantly since 1798. There were only three short periods of stagnation, the first from 1837 to 1850, the second 1910-1920 and the third 1970–1980. Particularly large increases occurred between 1888 and 1910 and between 1930 and 1970. Kriens celebrated a population of 10,000 in 1951; it reached 20,000 by 1970. Today Kriens is the third largest municipality in canton Lucerne, and one of the 25-biggest cities and municipalities in Switzerland. As per 1st Januar 2019, Kriens is officially called City of Kriens (Stadt Kriens). The historical population is given in the following table:
Housing there are 10,830 households, of which 3,760 households (or about 34.7%) contain only a single individual. 573 or about 5.3% are large households, with at least five members. there were 2,941 inhabited buildings in the municipality, of which 2,532 were built only as housing, and 409 were
mixed use buildings. There were 1,341 single family homes, 275 double family homes, and 916 multi-family homes in the municipality. Most homes were either two (918) or three (906) story structures. There were only 114 single story buildings and 594 four or more story buildings.
Languages The population speaks a dialect of
High Alemannic German. , 89.36% responded that their main language was German, 2.55% Italian, and 1.92% Serbian.
Religions denominations The population was formerly dominated by the
Catholic church, though today it is still the largest Christian denomination in Kriens, other have immigrated from other parts of Switzerland and abroad changing the demographics of the town's population. , the religious demography was as follows: The majority of the Muslims are Albanian and Bosnian, along with some other nationalities. The Orthodox Christians are mostly Serbians and Montenegrins. The Jews are generally members of the (orthodox) Hasidic branch of Judaism, and Swiss in nationality.
Origin-nationality Of the 25,190 inhabitants at the end of 2004, 21,409 were Swiss, and 3,781 (or about 15%) were foreigners. At the time of the last census, in 2000, 80.46% were Swiss citizens (85.30% including dual citizens). In contrast to the other large municipalities in Lucerne, there are no communities with a foreign immigrant majority in Kriens. ==Economy==