Last summer, researchers at Michigan State University reported that one in five Michigan adults, or about 1.7 million people, don't want children and therefore are child-free. Although that number was surprisingly large to many, data has now been confirmed in a follow-up study.
Anecdotally, the number of people who are childless has always been found to be around 20%. However in previous studies it was the number of adults living without children, and the childfree were simply folded into the childless or the ChildNotYet crowd.
This is limited to Michigan so results may vary, but this is the first study I recall that actually focused on childfree numbers.












