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Stephenson County, IL (shown in white) has 564.25 mi² of land area and 0.52 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 672.6' to a high of 1,168', with a weighted average of 870.9' above sea level.
Temperatures range from average lows around 11.4°F to average highs around 83.3°F. A year-round daily temperature averages 47.8°F. Average annual precipation is 41.3". With these temperatures and precipation, the majority of the county scores as an 5A 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 Stephenson County is 43,987 with 18,908 households. These households are spread across 12 unique municipalties (not all shown).
