As per Census of India, Type I towns are those which have a population of more than:

50,000 1 lakh 5 Lakh 2 Lakhs

1 lakh

Census of India classifies urban centres into six classes. Urban centre with population of more than one lakh is called a city or class I town. Cities accommodating population size between one to five million are called metropolitan cities and more than five million are mega cities.