It is given that, population of Sundarnagar in 1991 = 2,35,471
Increase in population in 2001 = 72,958
We know that, population of the city in 2001 = Population of Sundarnagar in 1991 + Increase in population in 2001
By substituting the values, population of the city in 2001 = 2,35,471 + 72,958
By addition, population of the city in 2001 = 3,08,429
Therefore, the population of the city in 2001 is 3,08,429.