Johnson County Precinct Results (as reported by parties; the Auditor's Office does not conduct the caucuses or tabulate results.)
- Democratic (attendance and delegate counts; the Iowa Democratic Party did not release caucus vote totals until 2020)
- Republican (attendance and vote totals)
While other registrations were processed between Jan. 3 and Jan. 16, the overwhelming majority were from the caucuses.
January 1, 2008 was the first day voters could register as Green or Libertarian under Iowa law.
|Jan. 2, 2008 - day before caucus|
|Jan. 16, 2008 - caucus data entry completed|