Kyburg is a settlement and former municipality in the district of Pfäffikon in the canton of Zürich in Switzerland, since 2016 part of the municipality of Illnau-Effretikon. History Kyburg castle is first mentioned in 1027 as Chuigeburch. A settlement close to the castle is first mentioned in the 1260s. It received its own jurisdiction and exemption from taxation from Albert II, Duke of Austria in 1337. After a fire in 1362, the town was rebuilt with ramparts and was granted a yearly and weekly market by Leopold III, Duke of Austria in 1370. Kyburg was occupied by Schwyz during the Appenzell Wars in 1407. It was partly destroyed in the Old Zürich War and rebuilt without fortification but retaining its market rights and jurisdiction. Kyburg lost all its privileges in 1798 and was incorporated as municipality in Fehraltdorf district. From 1803 to 1815 it was assigned to Uster-Grüningen district, from 1815 to 1831 it was once again administrative seat of a separate Oberamt Kyburg. From 1831 to 2015 it was a municipality in Pfäffikon district. On 1 January 2016 Kyburg was merged with the municipality of Illnau-Effretikon. Geography Kyburg has an area of . Of this area, 31.9% is used for agricultural purposes, while 61% is forested. Of the rest of the land, 5.4% is settled (buildings or roads) and the remainder (1.7%) is non-productive (rivers, glaciers or mountains). housing and buildings made up 2.8% of the total area, while transportation infrastructure made up the rest (2.4%). Of the total unproductive area, water (streams and lakes) made up 1.5% of the area. 2.4% of the total municipal area was undergoing some type of construction. The village is built on a Molasse stone outcropping in the Töss Valley. It is overlooked by the Kyburg castle, from which it takes its name. The municipality also includes the hamlets of Ettenhausen, portions of Billikon and Brünggen as well as the Fabriksiedlung or cloth manufacturing settlement of Mühlau an der Töss. It is . Demographics Kyburg has a population (as of ) of . , 7.4% of the population was made up of foreign nationals. the gender distribution of the population was 49.6% male and 50.4% female. Over the last 10 years the population has grown at a rate of 1.5%. Most of the population () speaks German (98.5%), with Serbo-Croatian being second most common (0.5%) and Italian being third (0.3%). In the 2007