Müswangen is first mentioned in 924 as Milizwaga.
Müswangen has an area of 4.5 km2 (1.7 sq mi). Of this area, 70.9% is used for agricultural purposes, while 24.2% is forested. Of the rest of the land, 4.7% is settled (buildings or roads) and the remainder (0.2%) is non-productive (rivers, glaciers or mountains). The municipality is located on the west slope of the Lindenberg mountain.
On 21 May 2006 an attempt to merge Hitzkirch and the surrounding 10 municipalities failed, when five of the eleven voted against the merger. A less ambitious merger was then proposed and accepted, with the municipalities of Gelfingen, Hämikon, Mosen, Müswangen, Retschwil and Sulz joining Hitzkirch on 1 January 2009.
Müswangen has a population (as of 2007[update]) of 453, of which 4.6% are foreign nationals. Over the last 10 years the population has grown at a rate of 4.1%. Most of the population (as of 2000[update]) speaks German (95.7%), with Albanian being second most common ( 2.3%) and French being third ( 1.8%).
The age distribution of the population (as of 2000[update]) is children and teenagers (0–19 years old) make up 34.6% of the population, while adults (20–64 years old) make up 56.7% and seniors (over 64 years old) make up 8.7%. The entire Swiss population is generally well educated. In Müswangen about 71.9% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either University or a Fachhochschule).
Müswangen has an unemployment rate of 1.05%. As of 2005[update], there were 61 people employed in the primary economic sector and about 24 businesses involved in this sector. 17 people are employed in the secondary sector and there are 5 businesses in this sector. 36 people are employed in the tertiary sector, with 10 businesses in this sector.
The historical population is given in the following table: