As of July 2008 the population of Winterthur is 100,000. More recently (as of 31 December 2011) the population was 102,966. As of 2007 23.6% of the population was made up of foreign nationals. As of 2008 the gender distribution of the population was 48.6% male and 51.4% female. Over the last 10 years the population has grown at a rate of 10.4%. Most of the population (as of 2000) speaks German (83.0%), with Italian being second most common (4.9%) and Albanian being third (2.0%).
The age distribution of the population (as of 2000) is children and teenagers (0–19 years old) make up 20.9% of the population, while adults (20–64 years old) make up 62.6% and seniors (over 64 years old) make up 16.5%. There are 42028 households in Winterthur.
As of 2008 there were 26,995 Catholics (26.7% of the population) and 37,327 Swiss Reformed Church members in Winterthur. Of the other Christian faiths, 326 (0.3%) were Lutheran, 203 (0.2%) were Christian Catholic, 3141 (3.1%) are some type of Christian Orthodox and 3,132 (3.1%) are another Christian faith. Of the rest of the population, 11,608 (11.5%) were Muslim, 108 (0.1%) were Jewish, 1,359 (1.3%) belonged to another non-Christian faith and 16,779 (16.6%) were atheist or agnostic or did not belong to any organized faith.
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