I have five different areas on a worksheet that I want to sort separately.
When it gets to the fourth section ("A43:f" & DMcnt), I get the following
error message:

"RunTime Error 1004
This operation requires the merged cells to be identically sized."

Not sure what I am doing wrong, any suggestions?

I use the following code for each group like this:

With Worksheets("CASB-Toronto Central Phone List").Range("a12:f" & AMcnt)
.Sort _
Key1:=.Columns(6), _
Order1:=xlAscending, _
Header:=xlNo, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
End With
With Worksheets("CASB-Toronto Central Phone List").Range("a21:f" & BMcnt)
.Sort _
Key1:=.Columns(6), _
Order1:=xlAscending, _
Header:=xlNo, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
End With
With Worksheets("CASB-Toronto Central Phone List").Range("a33:f" & CMcnt)
.Sort _
Key1:=.Columns(6), _
Order1:=xlAscending, _
Header:=xlNo, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
End With
With Worksheets("CASB-Toronto Central Phone List").Range("a43:f" & DMcnt)
.Sort _
Key1:=.Columns(6), _
Order1:=xlAscending, _
Header:=xlNo, _
OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
DataOption1:=xlSortNormal
End With
With Worksheets("CASB-Toronto Central Phone List").Range("a50:f" & EMcnt)
.Sort _
Key1:=.Columns(6), _
Order1:=xlAscending, _
Header:=xlNo
End With