17595, 17596, ?, 17599, ?, ?, 17602
30.000, 40.000, ?, 60.000, ?, ?, 90.000
The pattern in the first sequence is increasing by 1 each time. So, the missing numbers are 17597 and 17598.
The pattern in the second sequence is increasing by 10.000 each time. So, the missing numbers are 50.000 and 70.000.

The pattern in the third sequence is increasing by 1 each time. So, the missing numbers are 421 and 35.

The pattern in the fourth sequence is increasing by 10.000 each time. So, the missing numbers are 80.000 and 99.999.

The missing numbers in the equations are:
< > =
9897 ? 10.000
68534 ? 68499
34.000 ? 33.979
8.563 = 8.000 + ? + 60 + 3
45.031 = ? + 0 + ?
70.208 ? 6979

The smallest number among A 20107, B 19482, C 15999, D 18700 is C 15999.

The numbers with hundreds digit 8 are A 57680 and C 84273.

The rounded population of the ward is B 13.000.