Ethnic and religious composition of Austria-Hungary

The ethno-linguistic composition of Austria-Hungary according to the census of 31 December 1910 was as follows:

Largest cities
Data: census in 1910

Languages


In the Austrian Empire (Cisleithania), the census of 1911 recorded Umgangssprache, everyday language. Jews and those using German in offices often stated German as their Umgangssprache, even when having a different Muttersprache. The Istro-Romanians were counted as Romanians.

In the Kingdom of Hungary (Transleithania), the 1910 census was based on mother tongue. According to the census, 54.4% of the inhabitants of Hungary were recorded to speak Hungarian as their native language. This number included the Jewish ethnic group (around 5% of the population) who were overwhelmingly Hungarian-speaking (the Jews tending to declare German as mother tongue due to the immigration of Jews of Yiddish/German mother tongue).

Historical regions
The Germans in Croatia were mainly living in the eastern parts of the country where they had been settled along the Drava and Danube rivers, and the former Military Frontier (Militärgrenze), after the Habsburg (re)conquest of the area from the Ottomans in 1687.