American families continue to ditch their landlines for a wireless-only household, according to a study released by the Centers for Disease Control and Prevention.

The survey found that from July to December 2013, two in every five American households, or 41 percent of the 21,512 surveyed households, used only wireless telephone service.

In the last six months of 2013, the highest concentration of wireless-only households were found in the Midwest; the lowest, the Northeast.