One of the keys in determining how to reach Americans via the phone is how many are only reachable via a cell phone, how many are mostly cell phone, and how many are still landline-locked. While the overall rates put out by the National Center for Health Statistics (NCHS) are useful, the breakdown by state is often more enlightening.

NCHS put out updated state-by-state estimates in December for the prevalence of adults and children living in households that are wireless-only.

Among the states with the most adults living in wireless-only households are Arkansas (66.4 percent), Idaho (72.2 percent), Oklahoma (66.7 percent), Texas (67.9 percent), Utah (69 percent), and Wyoming (69.5 percent). On the opposite end of the spectrum are the states with the most adults living in landline-only households: Connecticut (6.6 percent), Maine (6.7 percent), Massachusetts (6.5 percent), Montana (6.3 percent), New York (6 percent), and especially Vermont (12.1 percent).

The state breakdown for kids in wireless-only households look dramatically different, however. Arizona (75.7 percent), Idaho (81.8 percent), Indiana (75.4 percent), Kansas (77.2 percent), Mississippi (80.9 percent), Oklahoma (75.7 percent), Texas (76.6 percent), and Wyoming (78.6 percent) lead the way. Vermont leads in kids in landline-only households (6.1 percent), but most states barely register.

The estimates are from 2018 and are based on small-area estimation methods with five years of data from the National Health Interview Survey and American Community Survey (ACS), with aid from NORC.