Beromünster has an area of 42.12 km² (16.26 sq mi).
 Of this area, 64.7% is used for agricultural purposes, while 21.1% is forested.
 Of the rest of the land, 14.1% is settled (buildings or roads) and the remainder (0.2%) is non-productive (rivers, glaciers or mountains).
 In the 1997 land survey, 16.32% of the total land area was forested.
 Of the agricultural land, 72.03% is used for farming or pastures, while 3.54% is used for orchards or vine crops.
 Of the settled areas, 4.29% is covered with buildings, 0.24% is industrial, 0.68% is classed as special developments, 0.27% is parks or greenbelts and 2.49% is transportation infrastructure.
 Of the unproductive areas,  0.1% is unproductive flowing water (rivers) and 0.03% is other unproductive land.

The municipality is located in the upper Wynental.
 It consists of two separate settlements, Flecken in a depression and the church owned village of Beromünster on the western side of a hill.
 Flecken consists of three rows of houses, built following a fire in 1764, along the main and parallel side road.
 Since 1 January 2009 it has also included the municipality of Gunzwil.
 The merged municipality in 2009 had an area of 29.35 km² (11.33 sq mi).
Beromünster has an area of 42.12 km² (16.26 sq mi).  Of this area, 64.7% is used for agricultural purposes, while 21.1% is forested.  Of the rest of the land, 14.1% is settled (buildings or roads) and the remainder (0.2%) is non-productive (rivers, glaciers or mountains).  In the 1997 land survey, 16.32% of the total land area was forested.  Of the agricultural land, 72.03% is used for farming or pastures, while 3.54% is used for orchards or vine crops.  Of the settled areas, 4.29% is covered with buildings, 0.24% is industrial, 0.68% is classed as special developments, 0.27% is parks or greenbelts and 2.49% is transportation infrastructure.  Of the unproductive areas,  0.1% is unproductive flowing water (rivers) and 0.03% is other unproductive land.
The municipality is located in the upper Wynental.  It consists of two separate settlements, Flecken in a depression and the church owned village of Beromünster on the western side of a hill.  Flecken consists of three rows of houses, built following a fire in 1764, along the main and parallel side road.  Since 1 January 2009 it has also included the municipality of Gunzwil.  The merged municipality in 2009 had an area of 29.35 km² (11.33 sq mi).
Beromünster