What was the population of the town as of 2010 in Rockingham County through which New Hampshire Route 121 winds through?
New Hampshire Route 121: New Hampshire Route 121 (abbreviated NH 121) is a 22.555 mi north–south state highway in Rockingham and Hillsborough counties in southeastern New Hampshire. New Hampshire Route 121:  The road winds through the communities of Atkinson, Hampstead, Sandown, Derry, Chester, and Auburn. Chester, New Hampshire: Chester is a town in Rockingham County, New Hampshire, United States. Chester, New Hampshire:  The population was 4,768 at the 2010 census.
4,768