Audignicourt is located some 20 km south-east of Noyon and 20 km north-west of Soissons. It can be accessed on the D563L road from Nampcel in the west and continuing east to Vassens. The D650 road also serves the commune and village branching off the D935 in the north. The southern and western borders of the commune are also the border between the departments of Aisne and Oise.
The commune is traversed by the Ru de Moulins stream from west to east and the commune is quite extensively forested around an extended area surrounding the stream. The rest of the commune is farmland with no other hamlets or villages.
In 2010 the commune had 102 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]
^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.