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Logan County, IL (shown in white) has 618.05 mi² of land area and 0.87 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 508.5' to a high of 708.7', with a weighted average of 599' above sea level.
Temperatures range from average lows around 17.9°F to average highs around 85.3°F. A year-round daily temperature averages 52.3°F. Average annual precipation is 40.2". 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 Logan County is 27,821 with 10,682 households. These households are spread across 13 unique municipalties (not all shown).
