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Washington County, OK (shown in white) has 415.52 mi² of land area and 8.83 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 593.8' to a high of 1,049.9', with a weighted average of 727.2' above sea level.
Temperatures range from average lows around 21.2°F to average highs around 93.3°F. A year-round daily temperature averages 58.6°F. Average annual precipation is 42.6". With these temperatures and precipation, the majority of the county scores as an 6B 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 53,530 with 21,497 households. These households are spread across 6 unique municipalties (not all shown).