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Rock Island County, IL (shown in white) has 427.5 mi² of land area and 23.8 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 538.1' to a high of 800.5', with a weighted average of 661.3' above sea level.
Temperatures range from average lows around 14.1°F to average highs around 85.8°F. A year-round daily temperature averages 50.8°F. Average annual precipation is 40.8". 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 Rock Island County is 143,863 with 60,434 households. These households are spread across 24 unique municipalties (not all shown).
