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Seneca County, OH (shown in white) has 551.03 mi² of land area and 1.77 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 649.6' to a high of 1,000.6', with a weighted average of 809.9' above sea level.
Temperatures range from average lows around 18.8°F to average highs around 85.7°F. A year-round daily temperature averages 51.5°F. Average annual precipation is 41.2". 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 Seneca County is 54,934 with 21,950 households. These households are spread across 14 unique municipalties (not all shown).