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Gilliam County, OR (shown in white) has 1,204.72 mi² of land area and 18.11 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 200.1' to a high of 4,199.5', with a weighted average of 1,958' above sea level.
Temperatures range from average lows around 23°F to average highs around 90.5°F. A year-round daily temperature averages 50.9°F. Average annual precipation is 12". With these temperatures and precipation, the majority of the county scores as an 7A 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 Gilliam County is 1,994 with 867 households. These households are spread across 3 unique municipalties (not all shown).
