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Mercer County, IL (shown in white) has 561.24 mi² of land area and 7.5 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 528.2' to a high of 856.3', with a weighted average of 677.6' above sea level.
Temperatures range from average lows around 13.5°F to average highs around 85.7°F. A year-round daily temperature averages 50.5°F. Average annual precipation is 40.6". 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 Mercer County is 15,623 with 6,549 households. These households are spread across 16 unique municipalties (not all shown).
