Hamlets and areas in Søgne include Ausviga, Eig, Høllen, Langenes, Lohne, Lunde, Ny-Hellesund, Trysnes, Vedderheia, Ålo, and Åros.

[4] The parish of Sygne (later spelled Søgne) was established as a municipality on 1 January 1838 (see formannskapsdistrikt law).

on 1 July 1913, the northern half of Søgne (population: 822) was separated to form the new municipality of Greipstad.

Then on 1 January 1965, the unpopulated Svalemyren area of neighboring Mandal municipality was transferred to Søgne.

The official blazon is "Per fess urdy azure and argent, two points to the chief" (Norwegian: Delt av blått og sølv ved gråverksnitt (med to spisser oppover)).

Above the line, the field has a tincture of argent which means it is commonly colored white, but if it is made out of metal, then silver is used.

The design of the line is meant to symbolize two stone road markers (varder), which in historical times were used to mark the paths and tracks that people followed.

A local tradition says they represent two girls standing on top of the hill looking for their lovers to return from fishing.

The original stone markers were destroyed by Germans during World War II and afterwards they were rebuilt in concrete.

The municipal council (Kommunestyre) of Søgne was made up of 27 representatives that were elected to four year terms.