Lachen (High Alemannic: Lache) is a municipality in March District in the canton of Schwyz in Switzerland.

Of the remaining land, 62.1% is settled (buildings or roads) and the remainder (5.4%) is non-productive (rivers, glaciers or mountains).

[5] The municipality is located on a delta of the Wägi river in the upper section of Lake Zurich.

[7] In the 2007 election the most popular party was the SVP which received 43.2% of the vote.

[5] According to the 2000 census[update], 4,141 or 66.0% of the population are Roman Catholic, while 984 or 15.7% belonged to the Swiss Reformed Church.

The wettest month is August during which time Lachen receives an average of 186 mm (7.3 in) of precipitation.

The driest month of the year is January with an average of 80 mm (3.1 in) of precipitation over 14.2 days.