The department of
Pas-de-Calais had fourteen constituencies. The thirteenth constituency of Pas-de-Calais was made up of: • town of
Billy-Montigny • Commune of
Fouquières-lès-Lens • town of
Lens • Municipality of
Loison-sous-Lens • town of
Noyelles-sous-Lens • town of
Sallaumines Source: Official Journal of October 14–15, 1958.
Since 1998 The thirteenth constituency of Pas-de-Calais was delimited as an electoral division by law n°86-1197 of the November 24, 1986. It includes the following administrative divisions : Cantons of Harnes, Lens Est, Lens Nord-Est, Lens Nord-Ouest. According to the general census of the population in 1999, carried out by the
Institut national de la statistique et des études économiques (INSEE), the population of this district was estimated at 105,072 inhabitants. ==Election results==