The borders of the 4th constituency of
Essonne have changed radically as a result of increase in the number of seats in the department. Prior to 1986 the seat covered the western edge of
Essonne and included only one canton
Limours that is within the boundaries of the seat today. The seat is a mix of the more rural cantons of
Limours and
Montlhéry along with the southern fringes of the
Paris suburbs around
Villebon-sur-Yvette. Politically the seat has changed substantially from a marginal profile prior to 1986 to a conservative stronghold. The seat's former representative
Nathalie Kosciusko-Morizet is a former minister, spokesperson for
Nicolas Sarkozy and candidate for
Mayor of Paris. == Historic Representation ==