Read all VBA populated rows

Question

Good morning,

I need to read the number of filled lines to perform a for, but some lines are blank and the function for when to find the blank line

col = Worksheets(1).Range("C4").End(xlDown).Row

    For i = 1 To col

For example : column C has 1129 lines but when it goes from line 259 to 260 this empty and it returns only up to 259

Could you suggest some alternative?

Thank you