How many countries are in Erope?

You mean Europe?

There are 44 countries in Europe.

Albania

Andorra

Austria

Belarus

Belgium

Bosnia and Herzegovina

Bulgaria

Croatia

Czech Republic

Denmark

Estonia

Finland

France

Germany

Greece

Holy See (Vatican City)

Hungary

Iceland

Ireland

Italy

Kosovo

Latvia

Liechtenstein

Lithuania

Luxembourg

Macedonia

Malta

Moldova

Monaco

Montenegro

Netherlands

Norway

Poland

Portugal

Romania

San Marino

Serbia

Slovakia

Slovenia

Spain

Sweden

Switzerland

Ukraine

United Kingdom

45 if you count the Vatican city.

Countries like Russia, Azerbaijan, Turkey, Kazakhstan, Armenia, and Georgia are Transcontinental countries as they belong to both Asia as well as Europe.