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Dallas County, IA (shown in white) has 588.3 mi² of land area and 3.31 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 820.2' to a high of 1,151.6', with a weighted average of 990' above sea level.
Temperatures range from average lows around 11°F to average highs around 86°F. A year-round daily temperature averages 49.5°F. Average annual precipation is 39.5". 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 Dallas County is 114,602 with 43,948 households. These households are spread across 14 unique municipalties (not all shown).
