| Friday 6 September 2019 | | *Kansas National Convention Delegate Selection Plan |
| Wednesday 11 December 2019 | | *Hawaii Party announcement |
| Monday 3 February 2020 | *Iowa Precinct Caucuses1 | *Iowa Precinct Caucuses |
| Tuesday 11 February 2020 | *New Hampshire Primary1 | *New Hampshire Primary |
| Saturday 22 February 2020 | *Nevada Precinct Viability Caucuses1 | *Nevada Alternative Presidential Preference Poll |
| Saturday 29 February 2020 | *South Carolina Primary1 | |
| Circa March - April 2020 (date not set) | | *Wyoming County Conventions |
| Tuesday 3 March 2020 | *Alabama Primary1
*Arkansas Primary1
*American Samoa Territorial Caucus1
*California Primary1
*Colorado Primary1
*Massachusetts Primary1
*Maine Primary1
*Minnesota Primary1
*North Carolina Primary1
*Oklahoma Primary1
*Tennessee Primary1
*Texas Primary1
*Utah Primary1
*Virginia Primary1
*Vermont Primary1 | *Alabama Primary
*Arkansas Primary
*California Primary
*Colorado Primary
*Massachusetts Primary
*Maine Primary
*Minnesota Primary
*North Carolina Primary
*Oklahoma Primary
*Tennessee Primary
*Texas Primary
*Utah Primary
*Vermont Primary |
| Tuesday 3 March - Tuesday 10 March 2020 | *Democrats Abroad Global Party Run Primary1 | |
| Tuesday 10 March 2020 | *Idaho Primary1
*Michigan Primary1
*Missouri Primary1
*Mississippi Primary1
*North Dakota Firehouse Caucuses1
*Washington Primary1 | *Idaho Primary
*Michigan Primary
*Missouri Primary
*Mississippi Primary
*Washington Primary |
| Saturday 14 March 2020 | *Northern Marianas Convention1 | *Guam Territorial Caucus |
| Circa March 2020 (date not set) | | *Northern Marianas Commonwealth Convention |
| Tuesday 17 March 2020 | *Arizona Primary1
*Florida Primary1
*Illinois Primary1 | *Florida Primary
*Illinois Primary |
| Wednesday 18 March 2020 | | *American Samoa Territorial Caucus |
| Friday 27 March - Sunday 29 March 2020 | | *North Dakota State Convention (cancelled -- issues addressed by mail ballots) |
| Thursday 2 April - Saturday 4 April 2020 | | *Alaska State Convention |
| Saturday 4 April 2020 | *Wyoming Presidential Preference County Caucuses (no in-person voting)1 | |
| Tuesday 7 April 2020 | *Wisconsin Primary1 | *Wisconsin Primary |
| Saturday 11 April 2020 | *Alaska Party-Run Primary1 | |
| Tuesday 28 April 2020 | *Ohio Primary1 | *Ohio Primary |
| Friday 1 May - Saturday 2 May 2020 | | *Virginia State Convention |
| Saturday 2 May 2020 | *Kansas Party-Run Primary1 | *South Carolina State Convention |
| Thursday 7 May - Saturday 9 May 2020 | | *Wyoming State Convention |
| Saturday 9 May 2020 | | *Arizona State Convention and Congressional District Caucus |
| Tuesday 12 May 2020 | *Nebraska Primary1 | *Nebraska Presidential Primary |
| Tuesday 19 May 2020 | *Oregon Primary1 | *Oregon Primary |
| Saturday 23 May 2020 | *Hawaii Party-run Presidential Preference Poll (firehouse primary)1 | |
| Saturday 30 May 2020 | | *Virgin Islands Territorial Caucus |
| Tuesday 2 June 2020 | *District of Columbia Primary1
*Indiana Primary1
*Maryland Primary1
*Montana Primary1
*New Mexico Primary1
*Pennsylvania Primary1
*Rhode Island Primary1
*South Dakota Primary1 | *District of Columbia Primary
*Indiana Primary
*Maryland Primary
*Montana Primary
*New Mexico Primary
*Pennsylvania Primary
*Rhode Island Primary
*South Dakota Primary |
| Friday 5 June 2020 | | *Puerto Rico Caucus |
| Saturday 6 June 2020 | *Guam Caucus1
*Virgin Islands District Caucuses1 | |
| Tuesday 9 June 2020 | *Georgia Primary1
*West Virginia Primary1 | *Georgia Primary
*West Virginia Primary |
| Tuesday 23 June 2020 | *Kentucky Primary (results delayed until 30 June)1
*New York Primary1 | *Kentucky Primary (results delayed until 30 June)
*New York Primary (cancelled - only 1 candidate) |
| Tuesday 7 July 2020 | *Delaware Primary1
*New Jersey Primary1 | *Delaware Primary
*New Jersey Primary |
| Saturday 11 July 2020 | *Louisiana Primary1 | *Louisiana Primary |
| Sunday 12 July 2020 | *Puerto Rico Primary1 | |
| Tuesday 11 August 2020 | *Connecticut Primary1 | *Connecticut Primary |
