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Warren County, IL (shown in white) has 542.38 mi² of land area and 0.65 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 557.7' to a high of 807.1', with a weighted average of 715.5' above sea level.
Temperatures range from average lows around 13.7°F to average highs around 84.9°F. A year-round daily temperature averages 50.4°F. Average annual precipation is 40.4". 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 Warren County is 16,287 with 6,505 households. These households are spread across 6 unique municipalties (not all shown).
