Ancienville is located some 10 km east by southeast of Villers-Cotterets and 25 km southwest of Soissons. The commune can be accessed by the D973 road from Villers-Cotterets in the northwest continuing west through the heart of the commune north of the village to Chouy. The D1370 runs south from the D973 and passes through the village continuing south to Noroy-sur-Ourcq. The commune is partly farmland with forests in an arc from the southwest to the northeast.
La Savieres river flows south forming the western border of the commune and continues to join the Ourcq river near Silly-la-Poterie.[3]