Kate Harris has pointed out to me that CDC just released a new report on the prevalence of wireless only households in the US, and this time they are providing state level estimates. The variation across states is dramatic to say the least. Oklahoma is estimated to have a whopping 26.2 percent of its households unreachable via a landline phone while Vermont is at just 5.1 percent.
These estimates are based on 2007 survey data when the national estimate was 14.7 percent of households. In 2008 that estimate rose to 17.5 percent.