Aguilcourt is 2 km south of the town of Guignicourt. From Guignicourt the commune can be reached by road D62 which runs from the north-west border of the commune through the village and continues to Orainville in the south-east. Highway D622 runs south-west from the village to Cormicy. The western edge of the commune is traversed by the A26 autoroute (E17) but the nearest exit is Exit 14 north of the commune and west of Guignicourt. Some 200m north-east of the town is the Grand Marais railway station just outside the border of the commune. From here trains run north to Guignicourt and south to Loivre.
The Suippe river forms most of the commune's northeastern border.
In 2010 the commune had 349 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][Note 2]
^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.
^In the census table and the graph, by convention in Wikipedia, and to allow a fair comparison between five yearly censuses, the principle has been retained for subsequent legal populations since 1999 displayed in the census table and the graph that shows populations for the years 2006, 2011, 2016, etc., as well as the latest legal population published by INSEE