The country has an area of 18,900 square miles and a population of 5.4 million. According to the 2001 census, self-described Roman Catholics constitute 68.9 percent of the population and Augsburg Lutherans 6.9 percent. Smaller religious groups include Greek Catholics, the Reformed Christian Church, Orthodox Christians, Jehovah's Witnesses, various Protestant groups, Jews, Baha'is, and Muslims.
There is some correlation between religious differences and political or ethnic differences. The Christian Democratic Party, which has ties to the Catholic faith, is the only political party to advocate an explicitly religious agenda. The founders of the Party of Conservative Democrats, a new offshoot of the Christian Democratic Party, are also closely associated with the Roman Catholic Church. Greek Catholics are ethnic Slovaks and Ruthenians (Ukrainians), although some Ruthenians follow the Orthodox faith. Followers of the Orthodox Church live predominantly in the eastern part of the country. The Reformed Christian Church is found primarily in the south, near the border with Hungary, where many ethnic Hungarians live. Other religious groups tend to be spread evenly throughout the country.