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Union County, SD (shown in white) has 460.76 mi² of land area and 6.37 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 1,086' to a high of 1,519', with a weighted average of 1,246.4' above sea level.
Temperatures range from average lows around 8°F to average highs around 86.4°F. A year-round daily temperature averages 47.7°F. Average annual precipation is 30.5". 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 Union County is 17,131 with 6,955 households. These households are spread across 7 unique municipalties (not all shown).
