Geroldswil is first mentioned in 1255 as Geroltzwiler.
Geography
Geroldswil has an area of. Of this area, 27% is used for agricultural purposes, while 24.3% is forested. Of the rest of the land, 42.9% is settled and the remainder is non-productive. housing and buildings made up 36.1% of the total area, while transportation infrastructure made up the rest. Of the total unproductive area, water made up 3.1% of the area. 43.8% of the total municipal area was undergoing some type of construction. Originally a linear village in the Limmattal, in the second half of the 20th Century, Geroldswil has grown into a suburban externsion of the agglomeration of Zürich.
Demographics
Geroldswil has a population of. , the gender distribution of the population was 50.2% male and 49.8% female., 25.97% of the population was made up of foreign nationals. Over the last 10 years the population has decreased at a rate of -3.9%. Most of the population speaks German , with Italian being second most common and Serbo-Croatian being third. In the 2007 election the most popular party was the SVP which received 44.3% of the vote. The next three most popular parties were the FDP, the SPS and the CVP. The age distribution of the population is children and teenagers make up 22.2% of the population, while adults make up 66.9% and seniors make up 10.9%. The entire Swiss population is generally well educated. In Geroldswil about 78.6% of the population have completed either non-mandatory upper secondary education or additional higher education. There are 2011 households in Geroldswil. Geroldswil has an unemployment rate of 2.25%. , there were 9 people employed in the primary economic sector and about 4 businesses involved in this sector. 450 people are employed in the secondary sector and there are 37 businesses in this sector. 1400 people are employed in the tertiary sector, with 187 businesses in this sector. 75% of the working population were employed full-time, and 25% were employed part-time. there were 1660 Catholics and 1537 Protestants in Geroldswil. In the, religion was broken down into several smaller categories. From the 2000 census, 41.9% were some type of Protestant, with 40.3% belonging to the Swiss Reformed Church and 1.6% belonging to other Protestant churches. 36.4% of the population were Catholic. Of the rest of the population, 0% were Muslim, 4.8% belonged to another religion, 2.7% did not give a religion, and 13.5% were atheist or agnostic. The historical population is given in the following table:
