The Idaho Secretary of State has released registration data as of February 5, 2021. The totals are: Republican 556,906; Democratic 145,479; Libertarian 11,581; Constitution 4,052; independent and miscellaneous 338,800.

Percentages are: Republican 52.70%; Democratic 13.77%; Libertarian 1.10%; Constitution .38%; independent and miscellaneous 32.06%.

In September 2020, the percentages were: Republican 52.88%; Democratic 14.13%; Libertarian 1.00%; Constitution .36%; independent and miscellaneous 31.64%.