The municipality lies roughly 3 km southeast of Hillesheim in the Vulkaneifel, a part of the Eifel known for its volcanic history, geographical and geological features, and even ongoing activity today, including gases that sometimes well up from the earth.

In 806, Villa Wallemaresdorp had its first documentary mention in a document dealing with a donation to Prüm Abbey; however, it is not universally agreed that this is a reference to Walsdorf.

The municipal election held on 7 June 2009 yielded the following results:[4] Walsdorf's mayor is Horst Well; the representative from the outlying centre of Zilsdorf is Helmut Hohn.

[1] The German blazon reads: In silbernem Schild ein schräglinker, roter Balken, belegt mit 3 goldenen Mispelblüten mit blauen Butzen, oben begleitet von einem roten Ring, unten von einer roten Lilie.

The municipality's arms might in English heraldic language be described thus: Argent a bend sinister gules charged with three cinquefoils Or pierced azure, the whole between an annulet and a fleur-de-lis, both of the second.