States and territories of India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 is a federal
Federal republic
A federal republic is a federation of states with a republican form of government. A federation is the central government. The states in a federation also maintain the federation...

 union of states comprising twenty-eight states and seven union territories
Union Territory
A Union Territory is a sub-national administrative division of India, in the federal framework of governance. Unlike the states of India, which have their own elected governments, union territories are ruled directly by the federal government; the President of India appoints an Administrator or...

. The states and territories are further subdivided
Subdivisions of India
The Administrative divisions of India are Indian subnational administrative units; they compose a nested hierarchy of country subdivisions. Indian states and territories frequently use different local titles for the same level of subdivision The Administrative divisions of India are Indian...

 into districts
Districts of India
A district is an administrative division of an Indian state or territory. Districts are further subdivided, in some cases into Sub-Divisions, and otherwise directly into tehsils or talukas.District officials include:...

 and so on.
The Census 2011 codes given in the table have been assigned by Census India from North-West to South-East.

The Constitution of India
Constitution of India
The Constitution of India is the supreme law of India. It lays down the framework defining fundamental political principles, establishes the structure, procedures, powers, and duties of government institutions, and sets out fundamental rights, directive principles, and the duties of citizens...

 distributes the sovereign powers exercisable with respect to the territory of any State between the Union and that State.