If I'm understanding you correctly, for Excel remove the Wrap Text for each column. Format, Cell, Alignment, remove the wrap text check.
In Word you may have to get creative and do a find and replace. If there are double returns ^p^p after the end of an address you problem should replace all of those first replacing those with a unique character like the bar "|". Then replace the single return ^p with a space. This will put your address in a single line. Now you need to replace the bar "|" with double ^p^p to separate each address.
I hope this help.