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Mercer County, NJ (shown in white) has 224.48 mi² of land area and 4.38 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 0' to a high of 469.2', with a weighted average of 133.7' above sea level.
Temperatures range from average lows around 22.7°F to average highs around 87.4°F. A year-round daily temperature averages 54°F. Average annual precipation is 49.9". With these temperatures and precipation, the majority of the county scores as an 7A 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 Mercer County is 387,846 with 139,753 households. These households are spread across 18 unique municipalties (not all shown).
