Wädenswil has a population (as of ) of . , 20.5% of the population was made up of foreign nationals. 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 2.1%. Most of the population () speaks German (85.0%), with Italian being second most common ( 3.9%) and Serbo-Croatian being third ( 1.9%). In the
2007 election the most popular party was the
SVP which received 35.2% of the vote. The next three most popular parties were the
SPS (17.6%), the
FDP (13%) and the
CSP (11.3%). The age distribution of the population () is 22% children and teenagers (0–19 years old), while adults (20–64 years old) make up 64.2% and seniors (over 64 years old) make up 13.9%. In Wädenswil about 76.7% of the population (between age 25–64) have completed either non-mandatory
upper secondary education or additional higher education (either university or a
Fachhochschule). There are 8796 households in Wädenswil. 44.8% of the working population were employed full-time, and 55.2% were employed part-time. there were 6128 Catholics and 7507
Protestants in Wädenswil. In the 2000 census, religion was broken down into several smaller categories. From the , 43.5% were some type of Protestant, with 40.5% belonging to the
Swiss Reformed Church and 3% belonging to other Protestant churches. 32.2% of the population were Catholic. Of the rest of the population, 5% were Muslim, 7.5% belonged to another religion (not listed), 4% did not give a religion, and 11.9% were atheist or agnostic. == Cultural heritage ==