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Alexander County, IL (shown in white) has 235.39 mi² of land area and 17.24 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 278.9' to a high of 800.5', with a weighted average of 391.1' above sea level.
Temperatures range from average lows around 25.8°F to average highs around 89.2°F. A year-round daily temperature averages 58.1°F. Average annual precipation is 54.1". With these temperatures and precipation, the majority of the county scores as an 6B 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 Alexander County is 4,829 with 2,187 households. These households are spread across 7 unique municipalties (not all shown).