There are about 10 million speakers of Czech in the Czech Republic, or Czechia, and about 200,000 speakers in various other countries. Within these other countries, Czech speakers are primarily emigrants and children of emigrants who left the Czech Republic in sizable migrations during World War I, World War II, and the years 1948 and 1968. Particularly large numbers of Czech speakers can be found in Austria (mostly in Vienna), Poland, Germany, Ukraine, Croatia (mostly in the Daruvar area), Western Romania (in Banat), Australia, and Canada. Since the split of Czechoslovakia at the end of 1992, several tens of thousands of Czechs have continued to live in the Slovak Republic. However, the largest group of Czech speakers outside the Czech Republic is found in the United States, in cities such as New York, Chicago, and Cleveland, as well as some rural communities in Texas, Wisconsin, Minnesota, and Nebraska. According to the US Census, more than 90,000 Czech speakers lived in the United States in 1990.
Source: Yamada Language Center, University of Oregon