Merrimack information on the site is deemed reliable, but not guaranteed. Our Merrimack stats, Merrimack census, and Merrimack information is aggregated from many different sources and may be dated. Currently, we have one hundred fifty-nine Merrimack foreclosures of fifty-six thousand two hundred forty-four Merrimack, New Hampshire housing units housing units, of which fifty-one thousand eight hundred forty-three are occupied, thirty-six thousand nineteen are owner occupied, fifteen thousand eight hundred twenty-four are rented, four thousand four hundred one are vacant, and nineteen thousand four hundred fifty-one have mortgages. has fifty-one thousand eight hundred forty-three households, and one hundred thirty-six thousand two hundred twenty-five citizens.