|• Total||4.98 km2 (1.92 sq mi)|
|Elevation||409 m (1,342 ft)|
|• Density||510/km2 (1,300/sq mi)|
|Surrounded by||Affoltern am Albis, Aristau (AG), Jonen (AG), Merenschwand (AG), Obfelden|
Ottenbach is first mentioned in 831 as in loco vocato marcha Hotumbacharia. In 1169 it was mentioned as Arnoldus de Ottonbac. Since the end of the 18th century, the textile industry had expanded as a home industry (Putting-out system) in Ottenbach: In 1784, the cotton spinning mill employed 49% of the local population (430 people, 287 of whom worked all year round). At the beginning of the 19th century there were around 350 weaving looms and the Zurich Mechanical Silk Weaving Mill employed more than 200 people in Ottenbach from the village and the surrounding area.
Ottenbach has an area of 5 km2 (1.9 sq mi). Of this area, 56.4% is used for agricultural purposes, while 20.7% is forested. Of the rest of the land, 19.1% is settled (buildings or roads) and the remainder (3.8%) is non-productive (rivers, glaciers or mountains).
Ottenbach owns the Ottenbach Small Hydro power plant with original equipment of 1920 which is still running for guided visits. It produced current for operating looms of the silk weaving factory A.F. Haas & Co. until 1975.
Ottenbach has a population (as of 31 December 2017) of 2,569. As of 2007[update], 7.3% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 5.5%. Most of the population (as of 2000[update]) speaks German (93.6%), with Italian being second most common ( 1.7%) and English being third ( 1.0%).
The age distribution of the population (as of 2000[update]) is children and teenagers (0–19 years old) make up 26.1% of the population, while adults (20–64 years old) make up 64.4% and seniors (over 64 years old) make up 9.6%. In Ottenbach about 84.9% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).
Ottenbach has an unemployment rate of 2.04%. As of 2005[update], there were 47 people employed in the primary economic sector and about 21 businesses involved in this sector. 144 people are employed in the secondary sector and there are 19 businesses in this sector. 388 people are employed in the tertiary sector, with 82 businesses in this sector. The historical population is given in the following table:
- "Arealstatistik Standard - Gemeinden nach 4 Hauptbereichen". Federal Statistical Office. Retrieved 13 January 2019.
- "Ständige Wohnbevölkerung nach Staatsangehörigkeitskategorie Geschlecht und Gemeinde; Provisorische Jahresergebnisse; 2018". Federal Statistical Office. 9 April 2019. Retrieved 11 April 2019.
- Ottenbach in German, French and Italian in the online Historical Dictionary of Switzerland.
- Swiss Federal Statistical Office accessed 24-Jul-2009
- "STAT-TAB – Ständige und nichtständige Wohnbevölkerung nach institutionellen Gliederungen, Geburtsort und Staatsangehörigkeit" (online database) (official site) (in German and French). Neuchâtel, Switzerland: Federal Statistical Office - FSO. Retrieved 17 September 2018.