The Most Comma Mistakes Mostly common sense although I disagree with the need for a comma after 'Des Moines, Iowa' as its absence introduces no awkwardness or ambiguity. #link You were reading The Most Comma Mistakes, a link posted with comment by MacDara Conroy. It is filed under Words and was published in April 2013. If you liked what you read here, you can follow this site on Twitter @MacDaraBlogs or via reader feed, and find many more entries in the Archive. Share this entry on Twitter, Tumblr, Facebook or Google+, or by email.