Onyx, CA has a population of 610 and is the 18,338th largest city in the United States. The population density is 53 per sq mi which is 77% lower than the California average and 41% lower than the national average. The median age in Onyx is 54 which is approximately 49% higher than the California average of 36. In Onyx, 47% of the population over 15 years of age are married, 77% speak English and 23% speak Spanish. 75% of Onyx residents were born in California, 15% were born out of state, 0% were born outside of the United States and 10% were foreign born.
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The population density in Onyx is 77% lower than California.
The median age in Onyx is 49% higher than California.
In Onyx 95.25% of the population is White.
In Onyx 0.00% of the population is Black or African American.