- Freedom of the press: Compares countries by freedom of the press. The lower the score, the more free the press of that country is. The scores are taken from the Freedom of the Press Index, elaborated by Freedom House, self-defined as "an independent watchdog organization dedicated to the expansion of freedom around the world". The data used in the index come from an annual survey of media independence in 197 countries and territories, assessing the degree of print, broadcast, and internet freedom in each of them.
- Nationalist party (percent of vote): This list shows the percentage of votes obtained by nationalist parties across Europe at the latest elections held in their respective countries. Note that the percentages show the votes from all the parties combined, and only for general elections (some parties may obtain a quite higher percentage in regional elections). Nationalist parties usually hold right-wing populist views, and among their common demands are a higher control of immigration, extended social/labor rights for country nationals, and a restriction of islamic customs -such as the veil or the construction of mosques-, though their ideologies and goals vary from country to country. Some parties have as their main goal the seggregation of a region from its parent country (with examples in Scotland, Catalonia and Northern Ireland). Most of nationalist parties with elected members in the European Parliament belong to the Europe of Freedom and Democracy group.
- Nationalist vote: Percentage of votes at the most recent national election that went to parties with a nationalist ideology.
- Press freedom index: Compares countries by their degree of government censorship, according to the Press freedom index. This index, created by the non-governmental organization Reporters without borders (RWS), is ellaborated using data from an extensive annual survey sent to professional reporters throughout the world. The survey contains questions about the type and ownership of media present in the country, freedom of speech, violence exerted against reporters, election campaigns, access of political parties to the media, etc.
- Votes for nationalist parties: Absolute number of votes at the most recent national election that went to parties with a nationalist ideology.