I did a little Google research regarding NH's requirement of ethanol-blended fuels. I haven't yet found anything that requires it state-wide, but I did find the following:
From the U.S. Energy Information Administration (June 16, 2016): "The state ... requires reformulated motor gasoline blended with ethanol to limit ozone formation in the populated areas of southeastern New Hampshire."
And from the NH Dept. of Environmental Services (2013): "In New Hampshire, the use of RFG is part of the State Implementation Plan (SIP), the state’s written strategy to reduce ozone in the four southeastern counties of Merrimack, Hillsborough, Rockingham and Strafford counties." They define RFG (reformulated gas) as fuel that "conforms to pollution reduction requirements established by the EPA...[which] may include some level of ethanol that is an oxygenate..."
"Conventional" gas is also available in NH, which NH defines as "gasoline that does not meet pollution reduction requirements." This conventional gas may also contain ethanol.
So it seems only four NH counties require ethanol-blended gas, or more specifically RFG, which may contain ethanol.