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Merrimack County, NH (shown in white) has 932.9 mi² of land area and 22.08 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 150.9' to a high of 2,798.6', with a weighted average of 727.7' above sea level.
Temperatures range from average lows around 12.4°F to average highs around 82.8°F. A year-round daily temperature averages 46.6°F. Average annual precipation is 48.5". With these temperatures and precipation, the majority of the county scores as an 5B using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).
The estimated population of Merrimack County is 157,745 with 62,036 households. These households are spread across 13 unique municipalties (not all shown).
