The California National Party conducted the latest poll. Their results mirrored earlier polls this year that had 33 percent of Californians in favor of the plan.
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That is up from 20 percent back in 2014.
The California National Party backs secession and includes many who identify as social Democrats and progressives.
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"So about half of our supporters wanted an independent California through democratic and peaceful means before Trump. And the other half got on board when they realized how broken American politics had become," chairperson Theo Slater said.
Half of Californians oppose secession, which would require amending the U.S. Constitution.
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