Wallbach is a municipality in the district of Rheinfelden in the canton of Aargau in Switzerland.

Wallbach has an area, as of 2009[update], of 4.51 square kilometers (1.74 sq mi).

[3] The blazon of the municipal coat of arms is Gules a Patriarchal Cross pattee Argent and in chief a Mullet of the same.

[7] The age distribution, as of 2008[update], in Wallbach is; 166 children or 9.5% of the population are between 0 and 9 years old and 230 teenagers or 13.1% are between 10 and 19.

[11] The historical population is given in the following table:[8] The Businger house and the Stelli, both parts of the late-Roman era Rhine fortifications are listed as Swiss heritage sites of national significance.

[12] The entire village of Wallbach is designated as part of the Inventory of Swiss Heritage Sites.

[7] From the 2000 census[update], 794 or 52.0% were Roman Catholic, while 336 or 22.0% belonged to the Swiss Reformed Church.

It was open a total of 270 days with average of 6 hours per week during that year.