Niedermuhlern has an area of 7.26 km² (2.80 sq mi).
As of 2012, a total of 5.46 km² (2.11 sq mi) or 75.3% is used for agricultural purposes, while 1.3 km² (0.50 sq mi) or 17.9% is forested.
The rest of the municipality is 0.44 km² (0.17 sq mi) or 6.1% is settled (buildings or roads).

During the same year, housing and buildings made up 2.6% and transportation infrastructure made up 2.8%.
A total of 14.8% of the total land area is heavily forested and 3.2% is covered with orchards or small clusters of trees.
Of the agricultural land, 40.6% is used for growing crops and 33.8% is pasturage.

The municipality is located on a plateau of Längenberg mountain.
It includes the village of Niedermuhlern, the hamlets of Ober- and Niederblacken, Bachmühle, Fallenbach and individual houses.

On 31 December 2009 Amtsbezirk Seftigen, the municipality's former district, was dissolved.
On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Bern-Mittelland.
Niedermuhlern has an area of 7.26 km² (2.80 sq mi). As of 2012, a total of 5.46 km² (2.11 sq mi) or 75.3% is used for agricultural purposes, while 1.3 km² (0.50 sq mi) or 17.9% is forested. The rest of the municipality is 0.44 km² (0.17 sq mi) or 6.1% is settled (buildings or roads).
During the same year, housing and buildings made up 2.6% and transportation infrastructure made up 2.8%. A total of 14.8% of the total land area is heavily forested and 3.2% is covered with orchards or small clusters of trees. Of the agricultural land, 40.6% is used for growing crops and 33.8% is pasturage.
The municipality is located on a plateau of Längenberg mountain. It includes the village of Niedermuhlern, the hamlets of Ober- and Niederblacken, Bachmühle, Fallenbach and individual houses.
On 31 December 2009 Amtsbezirk Seftigen, the municipality's former district, was dissolved. On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Bern-Mittelland.
Niedermuhlern