Yes.
it is a self governing body in itself
The term for a city that acts like its own country is a "city-state." These are self-governing cities that have their own independent political and economic systems. Examples include Singapore and Vatican City.
If by city-state you are referring to a single urban center that is self-governing, I can think of two examples. The first is Washington DC, which is mostly self-governing but is overseen by the US Congress. A more classic example is the Vatican or Holy See in Italy, where the city boundaries and the country boundaries are the same. I believe the Holy See is the smallest country in the world.
The country that has two self-governing countries in it is New Zealand, which consists of the North Island and the South Island. Each island has its own regional government and autonomy within the larger nation of New Zealand.
It's actually the Holy See, which is a self governing entity that holds the enclave of the Vatican City. It is located within the borders of Italy (actually within the city of Rome), but is not territory of the city of Rome or the nation of Italy.
Probably Vatican City, as it is a self-sufficient country unto its self, and a) there are no non-Catholic civil servants, and no non-Catholic clergy resident or working in the Vatican.
It is about 47.828 km². - about 110 acres. Just for others to know, Vatican city is a city in Rome, Italy. It is the world's smallest self-governing state. The city is an enclave of Rome, which means it is a country totally in the territorical boundaries of another bigger country.
I believe Niue is the smallest Self Governing country.
Yes... Sovereign self governed state like Vatican City and Singapore.
Yes... Sovereign self governed state like Vatican City and Singapore.
Gibraltar is a self governing overseas territory of the United Kingdom.
Denmark has two self-governing possessions.