Seewis im Prättigau has an area, as of 2006[update], of 49.6 km2 (19.2 sq mi).

Of the rest of the land, 2% is settled (buildings or roads) and the remainder (22.6%) is non-productive (rivers, glaciers or mountains).

It consists of the village of Seewis im Prättigau and the sections of Schmitten-Pardisla and the Seewis-Pardisla railway station on the valley floor.

[9] The age distribution, as of 2000[update], in Seewis im Prättigau is; 202 children or 15.3% of the population are between 0 and 9 years old and 195 teenagers or 14.7% are between 10 and 19.

[4] From the 2000 census[update], 186 or 14.1% are Roman Catholic, while 923 or 69.8% belonged to the Swiss Reformed Church.

[8] The historical population is given in the following table:[3] The ruins of Castle Fracstein are listed as a Swiss heritage site of national significance.