Agnicourt-et-Séchelles is located some 60 km south-east of Saint-Quentin and 20 km south by south-east of Vervins. It consists of two parcels of land joined by a narrow neck with both portions straddling road D58 between Tavaux-et-Pontséricourt in the west and Chaourse in the east. The southern portion of the commune is traversed by the D946 road from Marle in the west to Montcornet in the south-east almost parallel to the D58. Road D59 links the two roads in the commune and also to the village. The hamlet of Moranzy is at the intersection of Highway D58 and D59 and the hamlet of Séchelles lies in the eastern portion of the commune on Highway D58. The rest of the commune is entirely farmland.
In 2010, the commune had 207 inhabitants. The evolution of the number of inhabitants is known through the population censuses conducted in the town since 1793. From the 21st century, a census of municipalities with fewer than 10,000 inhabitants is held every five years, unlike larger towns that have a sample survey every year.[Note 1]
Church of Saint-Médard at Agnicourt (12th century)
Chapel of Saint Agapit at Séchelles
Chapel of Saint Agapit at Séchelles. In Séchelles, unlike most other villages in the area, the church does not overlook the area around it as space for housing was at a premium. The topology is different (flat and less rugged) so the mode of defence of the immediate vicinity of the building was different.
^At the beginning of the 21st century, the methods of identification have been modified by law No. 2002-276 of 27 February 2002 , the so-called "law of local democracy" and in particular Title V "census operations" which allow, after a transitional period running from 2004 to 2008, the annual publication of the legal population of the different French administrative districts. For municipalities with a population greater than 10,000 inhabitants, a sample survey is conducted annually, the entire territory of these municipalities is taken into account at the end of the period of five years. The first "legal population" after 1999 under this new law came into force on 1 January 2009 and was based on the census of 2006.