Ndejje is located in Luweero District, approximately 42 kilometres (26 mi), by road, north of Kampala, Uganda's capital and largest city.

[1] This location lies approximately 8 kilometres (5.0 mi), by road, northwest of the town of Bombo, on the Kampala-Masindi Highway.

However, Barnabus Iga Matovu, a journalist from the area, in 2012 gave the estimate population of Ndejje as over 10,000 (in a news article in a local newspaper).

Matovu says the population has rapidly increased from that of about 1,000 people after the NRM Liberation war (1981–86) due to the rise of schools in the area specifically the university.

The trading center also has attracted many people from villages around and land has become expensive.