Marbach is a municipality in the Wahlkreis (constituency) of Rheintal in the canton of St. Gallen in Switzerland.

Of the rest of the land, 16.7% is settled (buildings or roads) and the remainder (1.1%) is non-productive (rivers or lakes).

The blazon of the municipal coat of arms is Azure, a Bend wavy Argent and in chief sinister a letter M Or.

Of the foreign population, (as of 2000[update]), 36 are from Germany, 34 are from Italy, 129 are from ex-Yugoslavia, 27 are from Austria, 19 are from Turkey, and 45 are from another country.

[8] The age distribution, as of 2000[update], in Marbach is; 283 children or 15.9% of the population are between 0 and 9 years old and 301 teenagers or 16.9% are between 10 and 19.

[8] In the 2007 federal election the most popular party was the SVP which received 39.4% of the vote.

[4] Out of the total population in Marbach, as of 2000[update], the highest education level completed by 377 people (21.2% of the population) was Primary, while 603 (33.9%) have completed their secondary education, 179 (10.1%) have attended a Tertiary school, and 79 (4.4%) are not in school.

[11] From the 2000 census[update], 833 or 46.8% are Roman Catholic, while 549 or 30.9% belonged to the Swiss Reformed Church.