Zuzwil has a population (as of December 2018) of 578.
As of 2010, 3.7% of the population are resident foreign nationals.
Over the last 10 years (2000-2010) the population has changed at a rate of 23.6%.
Migration accounted for 16.5%, while births and deaths accounted for 4.5%.

Most of the population (as of 2000) speaks German (460 or 97.0%) as their first language, French is the second most common (6 or 1.3%) and English is the third (3 or 0.6%).

As of 2008, the population was 50.2% male and 49.8% female.
The population was made up of 276 Swiss men (48.1% of the population) and 12 (2.1%) non-Swiss men.
There were 277 Swiss women (48.3%) and 9 (1.6%) non-Swiss women.
Of the population in the municipality, 140 or about 29.5% were born in Zuzwil and lived there in 2000.
There were 200 or 42.2% who were born in the same canton, while 87 or 18.4% were born somewhere else in Switzerland, and 36 or 7.6% were born outside of Switzerland.

As of 2010, children and teenagers (0–19 years old) make up 22.5% of the population, while adults (20–64 years old) make up 55.9% and seniors (over 64 years old) make up 21.6%.

As of 2000, there were 172 people who were single and never married in the municipality.
There were 267 married individuals, 17 widows or widowers and 18 individuals who are divorced.

As of 2000, there were 33 households that consist of only one person and 18 households with five or more people.
In 2000, a total of 183 apartments (94.3% of the total) were permanently occupied, while 8 apartments (4.1%) were seasonally occupied and 3 apartments (1.5%) were empty.
The vacancy rate for the municipality, in 2011, was 0.43%.

The historical population is given in the following chart:
Zuzwil has a population (as of December 2018) of 578. As of 2010, 3.7% of the population are resident foreign nationals. Over the last 10 years (2000-2010) the population has changed at a rate of 23.6%. Migration accounted for 16.5%, while births and deaths accounted for 4.5%.
Most of the population (as of 2000) speaks German (460 or 97.0%) as their first language, French is the second most common (6 or 1.3%) and English is the third (3 or 0.6%).
As of 2008, the population was 50.2% male and 49.8% female. The population was made up of 276 Swiss men (48.1% of the population) and 12 (2.1%) non-Swiss men. There were 277 Swiss women (48.3%) and 9 (1.6%) non-Swiss women. Of the population in the municipality, 140 or about 29.5% were born in Zuzwil and lived there in 2000. There were 200 or 42.2% who were born in the same canton, while 87 or 18.4% were born somewhere else in Switzerland, and 36 or 7.6% were born outside of Switzerland.
As of 2010, children and teenagers (0–19 years old) make up 22.5% of the population, while adults (20–64 years old) make up 55.9% and seniors (over 64 years old) make up 21.6%.
As of 2000, there were 172 people who were single and never married in the municipality. There were 267 married individuals, 17 widows or widowers and 18 individuals who are divorced.
As of 2000, there were 33 households that consist of only one person and 18 households with five or more people. In 2000, a total of 183 apartments (94.3% of the total) were permanently occupied, while 8 apartments (4.1%) were seasonally occupied and 3 apartments (1.5%) were empty. The vacancy rate for the municipality, in 2011, was 0.43%.
The historical population is given in the following chart:
Zuzwil, Bern