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Washington County, IA (shown in white) has 568.83 mi² of land area and 2.06 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 547.9' to a high of 830', with a weighted average of 726.9' above sea level.
Temperatures range from average lows around 12°F to average highs around 85.4°F. A year-round daily temperature averages 49.5°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 Washington County is 22,769 with 8,999 households. These households are spread across 9 unique municipalties (not all shown).
