Elfingen is a former municipality in the district of Laufenberg in canton of Aargau in Switzerland.

While Alamanni graves have been discovered in the municipality and it was the seat of a fief holder from Murbach Abbey in the 7th Century, Elfingen is first mentioned in 1245 as Eolfingen.

[3] When the Abbey sold their holdings in Aargau to the Habsburg in 1291, Elfingen was included.

In the 18th century small-scale home spinning of cotton added to the local economy.

Of the rest of the land, 0.16 square kilometers (0.062 sq mi) or 3.8% is settled (buildings or roads), 0.02 km2 (4.9 acres) or 0.5% is either rivers or lakes.

[4] The municipality is located in the Laufenberg district in a hollow of the Jura plateau.

[5] The blazon of the municipal coat of arms is Gules a Patriarchal Cross patte Argent issuant from Coupeaux Vert.

[10] The age distribution, as of 2008[update], in Elfingen is; 24 children or 9.1% of the population are between 0 and 9 years old and 23 teenagers or 8.7% are between 10 and 19.

[12] About 74.4% 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).

[14] The historical population is given in the following table:[3] The village of Elfingen is designated as part of the Inventory of Swiss Heritage Sites.

[10] From the 2000 census[update], 51 or 21.3% were Roman Catholic, while 140 or 58.3% belonged to the Swiss Reformed Church.