Some of the main villages in Lyngdal include Austad, Byremo, Fleseland, Hæåk, Konsmo, Korshamn, Kvås, Skomrak, Svenevik, and Vivlemo.

The official blazon was "Vert a cow statant argent" (Norwegian: I grønt en stående sølv ku).

The cow had a tincture of argent which meant it was commonly colored white, but if it was made out of metal, then silver was used.

The tree and wavy lines have a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used.

There are three white lines to represent the three large rivers in the municipality: Lygna, Audna, and Mandalselva.

The island of Sælør on the southern coast of the municipality is mentioned in Snorre, as the king Saint Olav spent a winter here in 1028.

Based around the port of Agnefest, Lyngdal prospered on maritime trade, and in 1771 an application was made for status as a small coastal town.

A census from 1801 showed 3529 inhabitants in the area that today makes up Lyngdal: 1850 in Å, 929 in Austad, 585 in Kvås and 165 in the eastern part of Spangereid.

[13] Religious life and missionary work have always had a strong position in Lyngdal, and worthy of special note is the minister Gabriel Kielland (1796–1854), who served in the parish from 1837 to 1854, and his wife Gustava (1800–1889).

Known today as a missionary pioneer and a popular songwriter, Gustava also wrote one of the first autobiographies by a woman in Norway: her "Reminiscence from my Life" from 1880.

Lyngdal municipality includes the southern portion of the Lyngdalen valley which follows the river Lygna to the Lyngdalsfjorden in the west.

The municipal council (Kommunestyre) of Lyngdal is made up of 29 representatives that are elected to four year terms.