Unterendingen is a former municipality in the district of Zurzach in the canton of Aargau in Switzerland.

Of the rest of the land, 0.28 km2 (0.11 sq mi) or 8.1% is settled (buildings or roads), 0.01 km2 (2.5 acres) or 0.3% is either rivers or lakes.

[3] The blazon of the municipal coat of arms is Per fess Azure a Fleur-de-lis mediated Argent and Gules.

There was 1 Swiss man, and 3 non-Swiss men who emigrated from Switzerland to another country.

[5] The age distribution, as of 2008[update], in Unterendingen is; 28 children or 7.6% of the population are between 0 and 9 years old and 66 teenagers or 17.9% are between 10 and 19.

[2] In the 2007 federal election the most popular party was the SVP which received 30.5% of the vote.

In the federal election, a total of 123 votes were cast, and the voter turnout was 47.3%.

[9] The historical population is given in the following table:[6] The entire village of Unterendingen is designated as part of the Inventory of Swiss Heritage Sites.

[2] From the 2000 census[update], 186 or 50.1% were Roman Catholic, while 128 or 34.5% belonged to the Swiss Reformed Church.