Birmensdorf is first mentioned in 876 as Piripoumesdorf.
Geography
Birmensdorf has an area of. Of this area, 41% is used for agricultural purposes, while 38.3% is forested. Of the rest of the land, 20.2% is settled and the remainder is non-productive. housing and buildings made up 12.8% of the total area, while transportation infrastructure made up the rest. Of the total unproductive area, water made up 0.4% of the area. 14.1% of the total municipal area was undergoing some type of construction. The municipality is located in the Reppischtal. It includes the hamlet of Landikon and numerous scattered farm houses. The village of Birmensdorf includes the former hamlets of Wullikon, Schüren, Güpf, Uf Dorf and Risi. The Wüeribach stream empties into the Reppisch near Birmensdorf.
Demographics
Birmensdorf has a population of. , 19.0% of the population was made up of foreign nationals. the gender distribution of the population was 49.8% male and 50.2% female. Over the last 10 years the population has grown at a rate of 13.7%. Most of the population speaks German , with Italian being second most common and French being third. In the 2007 election the most popular party was the SVP which received 41% of the vote. The next three most popular parties were the SPS, the FDP and the CVP. The age distribution of the population is children and teenagers make up 19% of the population, while adults make up 67.6% and seniors make up 13.3%. The entire Swiss population is generally well educated. In Birmensdorf about 80.3% of the population have completed either non-mandatory upper secondary education or additional higher education. There are 2508 households in Birmensdorf. Birmensdorf has an unemployment rate of 2.38%. , there were 78 people employed in the primary economic sector and about 27 businesses involved in this sector. 440 people are employed in the secondary sector and there are 66 businesses in this sector. 1270 people are employed in the tertiary sector, with 188 businesses in this sector. 43.6% of the working population were employed full-time, and 56.4% were employed part-time. there were 1738 Catholics and 2227 Protestants in Birmensdorf. In the religion was broken down into several smaller categories. From the 2000 census, 46.5% were some type of Protestant, with 44.6% belonging to the Swiss Reformed Church and 1.9% belonging to other Protestant churches. 30.1% of the population were Catholic. Of the rest of the population, 0% were Muslim, 5.2% belonged to another religion, 3.2% did not give a religion, and 14% were atheist or agnostic. The historical population is given in the following table:
