Rümikon is a village and former municipality in the district of Zurzach in the canton of Aargau in Switzerland.

Its late Roman watchtower at the Sandgraben is listed as a heritage site of national significance.

Along the river Rhine, in the municipal area, are the remains of two Roman era watchtowers.

[3] The Freiherr von Waldhausen granted the village to the provost of Wislikofen, who ran the low courts.

[4] The village is located in the Zurzach district, between the Rhine river and the Jura mountains.

The blazon of the municipal coat of arms is Azure a Salmon Argent between three Mullets of the same one and two.

[7] The age distribution, as of 2008[update], in Rümikon is; 20 children or 8.8% of the population are between 0 and 9 years old and 27 teenagers or 11.9% are between 10 and 19.

[8] In the 2007 federal election the most popular party was the SVP which received 41.47% of the vote.

In the federal election, a total of 78 votes were cast, and the voter turnout was 53.4%.

[12] The historical population is given in the following table:[3][9] The Sandgraben, a portion of the Roman era Rhine fortifications, is listed as a Swiss heritage site of national significance.

[8] From the 2000 census[update], 100 or 44.1% were Roman Catholic, while 76 or 33.5% belonged to the Swiss Reformed Church.

[10] Rümikon AG railway station is served by Zurich S-Bahn line S36, which links Bülach and Waldshut.