The first written mention of Eilendorf occurs in 1238, in a donation registry noting a gift from the Abbot Florenz of Kornelimünster Abbey to St. Adalbert Church in Aachen.

The Eilendorf coat of arms is divided vertically into two parts: on its left side (heraldic right) are two mining hammers crossed against a blue field, as well as a stylized viola.

Its right (heraldic left) contains the Cornelius horn (inherited from the nearby Kornelimünster Abbey) against a red field.

[5] The St. Severin Parish goes back to the founding of the Kornelimünster Abbey: at the site of an earlier (probably Romanesque) church, Abbot Hyazinth Alfons, Count von Suys (1713–1745), established a new place of worship, with the patron saint chosen then being St. Sebastian.

This place of worship was replaced in 1864 after plans for a larger, three-nave church in the neoromantic style were drawn up by the Cologne master builder Heinrich Wiethase.

The changing of the patron saint from St. Sebastian to St. Severin occurred following the incorporation of the parish into the Archdiocese of Cologne.

The highest point in Eilendorf is known as the Wolfsberg or Gottes Segen (God Bless) and rises 230 meters above sea level.

Through the area in the direction of the Eifel, there is a 50 metres (160 feet) difference in height between the Eilendorf communities of Nirm and Oberdorf.

For the most part, Eilendorf is surrounded by fields and nature except from the west, where it is connected to the Aachen-Mitte district of Rothe Erde.

This green space is used mostly for cows, rather than heavily agriculture, though the number of farmers in the area has decreased dramatically over the last 50 years.

Most of the fields are used for the production of hay, and the Haarbach (a small stream and tributary of the Wurm) flows northeast beneath the district of Nirm and across the train lines connecting Aachen to Eschweiler.