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Iroquois County, IL (shown in white) has 1,117.4 mi² of land area and 1.64 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 597.1' to a high of 813.6', with a weighted average of 665.8' above sea level.
Temperatures range from average lows around 15.8°F to average highs around 84.7°F. A year-round daily temperature averages 51°F. Average annual precipation is 42". 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 Iroquois County is 26,738 with 11,023 households. These households are spread across 20 unique municipalties (not all shown).
