There were 419,362 signatures verified by the Secretary of State's Office.
Even if Californians voted for the initiative, it would still require congressional approval.
Northern California, containing the 40 northern-most counties - including Sacramento and San Franciso - stretching from the OR border to Merced County.
A second state, Southern California or a name to be chosen by its residents, would consist of Orange, Riverside, San Bernardino, San Diego, Imperial, Kern, Kings, Fresno, Tulare, Inyo, Madera and Mono counties.
California (new): This would include six counties: Los Angeles, Ventura, Santa Barbara, San Luis Obispo, Monterey, and San Benito counties.
If the proposal ever makes it to Capitol Hill, one hurdle in a Republican-controlled Congress would be the idea of awarding the deep blue state four more senators, likely Democratic senators.
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If the unlikely plan is successful, it would be the first time an existing US state split since West Virginia was created in 1863.
If passed by a majority of voters, it would kickstart a years-long legal battle between local and federal authorities and would eventually find its way to Congress. With its 55 electors in the Electoral College, California has always been a stronghold for the Democratic Party.
It says that the California states will have more of the region's influence within the federal government with more seats in the US Senate.
The plan would create three differently sized regions, but all would have roughly the same population.
Critics of the initiative say having three Californias would actually diminish the power of Democrats. It received more than 402,468 valid signatures, more than the amount required by state law, thanks to an ambitious campaign, called Cal 3, and financial backing from the early investor in Tesla, Skype, and Hotmail.
This will not be the first time such a ballot would take place. President Donald Trump's victory in 2016 led to a ballot movement to have California secede from the U.S. That effort failed to gain enough signatures last year but was started again this year, CNBC reported.