Simplify the following text for a Grade 8 native English-speaking person.
Original: According to the 2001 India census , Agra has a population of 1,275,134 , while the population of Agra cantonment is 50,968 and that of Agra district is 3,620,436 .
Simplified: According to the 2001 Indian census , Agra had a population of 1,326,000 .