Lenzburg is a town in the central region of the Swiss canton Aargau and is the capital of the Lenzburg District. The town, founded in the Middle Ages, lies in the Seetal valley, about 3 kilometres south of the Aare river. Lenzburg and the neighbouring municipalities of Niederlenz and Staufen have grown together in an agglomeration.
A Neolithic grave field of the Cortaillod culture has been discovered on the Goffersberg (close to the Lenzburg Castle) dating from 4300 - 3500 BCE. A Roman theater was uncovered when a motorway was built in 1964. It was part of a small settlement with 500 inhabitants that existed for approximately 200 years. The settlement was abandoned in the 3rd century. In the 5th and 6th centuries, an Alamanni settlement existed. Lenzburg is first mentioned in 924 as de Lencis.
In 1036, Lenzburg Castle was used for the first time as seat for the Count of Lenzburg, then an important lord. The house however died out in 1173, and the castle was then transferred to emperor Frederick Barbarossa. In the following period, it was mainly used by the Kyburger house. The Habsburgs took over the castle in 1273. City rights were granted in 1306.
Lenzburg is a town in Switzerland. The term may also refer to:
Lenzburg District is a district of the Canton of Aargau in Switzerland, lying at the center of the canton. The district capital is the town of Lenzburg. It has a population of 57,487 (as of 31 December 2014).
The Lenzburg district has an area, as of 2009, of 102.71 square kilometers (39.66 sq mi). Of this area, 42.6 km2 (16.4 sq mi) or 41.5% is used for agricultural purposes, while 34.14 km2 (13.18 sq mi) or 33.2% is forested. Of the rest of the land, 20.16 km2 (7.78 sq mi) or 19.6% is settled (buildings or roads).
The blazon of the district coat of arms is Argent a Hurt.
Bezirk Lenzburg has a population (as of December 2014) of 57,487.As of June 2009, 19.7% of the population are foreign nationals.
In 2000 there were 24,407 workers who lived in the district. Of these, 18,072 or about 74.0% of the residents worked outside the Lenzburg district while 14,959 people commuted into the district for work. There were a total of 21,294 jobs (of at least 6 hours per week) in the district.