The museum and zoo began the formal process of adding their millage request to the November 2016 ballot on Wednesday with a committee meeting.
The proposed 15-year millage would cost $44 a year for the owner of a home with a taxable value of $100,000.
The funds generated by the millage would be equally split between the GRPM and John Ball Zoo and pay for renovations, improvements and additional education programs.
“To keep these cultural institutions strong, we must ensure they can continue to serve our families and keep our economy growing,” supporters of the ballot measure said in a statement Wednesday.
Museum and zoo officials said the millage would unlock perks for Kent County residents, including free museum parking, free museum admission for Kent County children and free group admissions to the zoo for all elementary school children.