During the Middle Ages the low justice right went the local Habsburg vassal, and the village became part of the bailiwick of Eiken.

The Chapel of St. Ursula, which was partly built from Roman stones, was originally owned by the monastery of St. Martin in Rheinfelden and until 1791 it was a small hermitage.

By World War I, many residents went to the German city of Säckingen to go to market or to work in the factory.

Since 1945, Münchwilen has had good connections with outside trade and industry, which include the train station at Stein and the A3 motorway onramp at Eiken.

Of the rest of the land, 0.7 km2 (0.27 sq mi) or 28.5% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.4% is either rivers or lakes.

[4] The municipality is located in the Laufenburg district, on a terrace between Sisslerfeld and the Jura mountains.

The blazon of the municipal coat of arms is Azure a Monk passant clad and wearing hat and sandals Marron and holding a pilgrim stick Argent.

[8] The age distribution, as of 2008[update], in Münchwilen is; 68 children or 9.5% of the population are between 0 and 9 years old and 66 teenagers or 9.2% are between 10 and 19.

[10] About 73.8% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[8] From the 2000 census[update], 347 or 59.1% were Roman Catholic, while 169 or 28.8% belonged to the Swiss Reformed Church.