Together with the adjoining city of Konstanz just across the border in Germany, Kreuzlingen is part of the largest conurbation on Lake Constance with a population of almost 120,000.

[citation needed] The territory of the municipality, except for the Augustinian monastery, belonged to the Bishop of Constance.

When the Eidgenossen conquered Thurgau in 1460 and further with the Reformation, the ties to the neighboring city loosened.

[citation needed] Until the beginning of the 19th century, the present center of Kreuzlingen was still largely agricultural.

In 1947 Kreuzlingen passed the mark of 10,000 residents, thus becoming according to Swiss statistical convention a town.

The Sanatorium of Bellevue (1857–1980), which occupied part of the old monastery, played an important role in the history of Kreuzlingen.

[citation needed] In 1842, Ignaz Vanotti from Constance bought a large tract of land and built a residential and commercial building in 1843 to house the emigrant press of Bellevue, which had previously been located in Römerburg.

In 1857, Ludwig Binswanger, a psychiatrist from Münsterlingen acquired the property and opened a private sanatorium.

[citation needed] Important psychiatric advances, particularly under the founder's grandson, also called Ludwig Binswanger, especially in the development of existential psychotherapy, were made at the sanatorium.

[citation needed] Kreuzlingen has an area, as of 2009[update], of 11.49 square kilometers (4.44 sq mi).

[4] The municipality is located in the Kreuzlingen district on the border with the German city of Konstanz.

It is located on Lake Constance where it narrows to form the Untersee, bordering with Konstanz in Germany.

[6] The age distribution, as of 2009[update], in Kreuzlingen is; 1,651 children or 8.7% of the population are between 0 and 9 years old and 1,908 teenagers or 10.1% are between 10 and 19.

[11] The historical population is given in the following table:[3] The Former Augustinian Chorherrenstift of St Ulrich, the former granary and wine press at Seeburgscheune and Seeburg Castle are listed as Swiss heritage site of national significance.

[13] In the late 2010s, Kreuzlingen's downtown began to experience a dearth of shoppers as many of them, including buses from elsewhere in Switzerland that pass through the city, started crossing the border to shop in Konstanz instead, due to lower prices for basic items in Germany, a favorable exchange rate between the euro and the franc and a German VAT refund that allows shoppers from non-European Union countries such as Switzerland to get back as much as a fifth of the price of the goods they buy.

Elected officials from the city have asked the national government to negotiate a change in this policy with their German counterparts as they feel it is anti-competitive; at the same time some Konstanz residents, feeling displaced in their own hometown by the onslaught of Swiss on weekends, have opened businesses in Kreuzlingen that primarily cater to other Germans.

The lower and upper primary levels begin at about age 5-6 and last for 6 years.

At the lower primary level, there were 225 children or 50.4% of the total population who were female, 245 or 54.9% were not Swiss citizens and 218 or 48.9% did not speak German natively.

In the upper primary level, there were 224 or 49.2% who were female, 221 or 48.6% were not Swiss citizens and 217 or 47.7% did not speak German natively.

There were 318 teenagers who were in the advanced school, of which 179 or 56.3% were female, 93 or 29.2% were not Swiss citizens and 92 or 28.9% did not speak German natively.

There were 274 teenagers who were in the standard school, of which 124 or 45.3% were female, 173 or 63.1% were not Swiss citizens and 174 or 63.5% did not speak German natively.

Finally, there were 30 teenagers who were in special or remedial classes, of which 13 or 43.3% were female, 20 or 66.7% were not Swiss citizens and 20 or 66.7% did not speak German natively.