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Mercer County, OH (shown in white) has 462.45 mi² of land area and 10.98 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 797.2' to a high of 1,063', with a weighted average of 875.2' above sea level.
Temperatures range from average lows around 18.6°F to average highs around 84.2°F. A year-round daily temperature averages 51.4°F. Average annual precipation is 40.7". With these temperatures and precipation, the majority of the county scores as an 6A 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 42,747 with 16,371 households. These households are spread across 10 unique municipalties (not all shown).
