Steinach has a population (as of ) of . , about 21.0% of the population was made up of foreign nationals. Of the foreign population, (), 69 are from
Germany, 113 are from
Italy, 210 are from ex-
Yugoslavia, 47 are from
Austria, 63 are from
Turkey, and 74 are from another country. Over the last 10 years the population has grown at a rate of 17.6%. Most of the population () speaks German (89.9%), with Serbo-Croatian being second most common ( 3.0%) and Italian being third ( 2.2%). Of the Swiss national languages (), 2,606 speak
German, 11 people speak
French, 63 people speak
Italian, and 6 people speak
Romansh. there were 409 persons (or 14.1% of the population) who were living alone in a private dwelling. There were 815 (or 28.1%) persons who were part of a couple (married or otherwise committed) without children, and 1,456 (or 50.2%) who were part of a couple with children. There were 144 (or 5.0%) people who lived in single parent home, while there are 25 persons who were adult children living with one or both parents, 9 persons who lived in a household made up of relatives, 22 who lived household made up of unrelated persons, and 19 who are either institutionalized or live in another type of collective housing. In the
2007 federal election the most popular party was the
SVP which received 36.1% of the vote. The next three most popular parties were the
CVP (25%), the
SP (16.1%) and the
FDP (9.8%). In Steinach about 72.3% of the population (between age 25–64) have completed either non-mandatory
upper secondary education or additional higher education (either university or a
Fachhochschule). Out of the total population in Steinach, , the highest education level completed by 663 people (22.9% of the population) was
Primary, while 1,172 (40.4%) have completed their secondary education, 304 (10.5%) have attended a
Tertiary school, and 107 (3.7%) are not in school. The remainder did not answer this question. ==Economy==