[3] Alpnach has an area, as of 2006[update], of 53.8 square kilometers (20.8 sq mi).

Of the rest of the land, 5% is settled (buildings or roads) and the remainder (8.9%) is non-productive (rivers, glaciers or mountains).

While in the 20th century, it expanded into a Haufendorf (an irregular, unplanned and quite closely packed village, built around a central square).

[4] The historical population is given in the following table:[3] Alpnach is served by Alpnach Dorf station and Alpnachstad station on the Brünig line, an inter-regional narrow-gauge railway from Interlaken to Lucerne.

The main sights of Alpnach include the world's steepest rack railway to the mountain Pilatus, a Roman mansion, and a hand-operated print shop.