| Tuesday 13 January 2004 | *District of Columbia Primary | |
| Saturday 17 January - Saturday 21 February 2004 | | *South Carolina District Conventions |
| Monday 19 January 2004 | *Iowa Caucus1 | *Iowa Caucus |
| Tuesday 27 January 2004 | *New Hampshire Primary1 | *New Hampshire Primary |
| Tuesday 3 February 2004 | *Arizona Primary1
*Delaware Primary1
*Missouri Primary1
*New Mexico Presidential Preference Caucus1
*North Dakota Precinct Caucuses1
*Oklahoma Primary1
*South Carolina Party-run Primary1 | *Missouri Primary
*Oklahoma Primary |
| Tuesday 3 February - Sunday 29 February 2004 | | *Wyoming County Conventions |
| Friday 6 February - Monday 9 February 2004 | *Democrats Abroad Local Caucuses1 | |
| Saturday 7 February 2004 | *Washington Precinct Caucuses1
*Michigan Party-run Primary1 | |
| Sunday 8 February 2004 | *Maine Municipal Caucuses1 | |
| Tuesday 10 February 2004 | *Tennessee Primary1
*Virginia Primary1 | *District of Columbia Caucus
*Tennessee Primary |
| Saturday 14 February 2004 | *District of Columbia Ward Caucus1
*Nevada Precinct Caucuses1 | |
| Tuesday 17 February 2004 | *Wisconsin Primary1 | *Wisconsin Primary |
| Friday 20 February - Monday 23 February 2004 | *Democrats Abroad Country Caucuses | |
| Saturday 21 February 2004 | | *Guam Territorial Caucus |
| Tuesday 24 February 2004 | *Hawaii Precinct Caucus1
*Idaho County Caucus1
*Utah Party Run Primary1 | |
| Saturday 28 February 2004 | | *American Samoa Territorial Caucus
*Virgin Islands Territorial Caucus |
| Sunday 29 February 2004 | | Puerto Rico Primary (cancelled) |
| Monday 1 March - Tuesday 15 June 2004 | | *Kansas Caucus/Convention |
| Tuesday 2 March 2004 | *California Primary1
*Connecticut Primary1
*Georgia Primary1
*Maryland Primary1
*Massachusetts Primary1
*Minnesota Precinct Caucuses1
*New York Primary1
*Ohio Primary1
*Rhode Island Primary1
*Vermont Primary1 | *California Primary
Connecticut Primary (cancelled)
*Georgia Primary
*Maryland Primary
*Massachusetts Primary
New York Primary (cancelled)
*Ohio Primary
*Rhode Island Primary
*Vermont Primary |
| Saturday 6 March - Saturday 20 March 2004 | *Wyoming County Caucuses1 | |
| Monday 8 March 2004 | *American Samoa Territorial Convention1 | |
| Tuesday 9 March 2004 | *Florida Primary1
*Louisiana Primary1
*Mississippi Primary1
*Texas Primary1 | Florida Primary (cancelled)
*Louisiana Primary
Mississippi Primary (cancelled)
*Texas Primary |
| Saturday 13 March 2004 | *Kansas Local Unit Caucuses1 | |
| Tuesday 16 March 2004 | *Illinois Primary1 | *Illinois Primary |
| Saturday 20 March 2004 | *Alaska Precinct Caucuses and District Caucuses1 | |
| Saturday 20 March - Saturday 24 April 2004 | | *North Carolina District Conventions |
| Saturday 27 March 2004 | *Democrats Abroad Regional Caucuses | |
| Sunday 28 March 2004 | *Democrats Abroad Global Convention | |
| Thursday 1 April - Sunday 4 April 2004 | | *North Dakota State Convention |
| Friday 2 April - Sunday 4 April 2004 | *North Dakota State Convention | |
| Saturday 3 April 2004 | *Kansas District Caucuses | |
| Tuesday 13 April 2004 | *Colorado Precinct Caucus1 | |
| Friday 16 April - Sunday 18 April 2004 | *Nevada State Convention | |
| Saturday 17 April 2004 | *Virgin Islands Territorial Convention1
*North Carolina County Caucuses and Conventions1 | |
| Saturday 24 April 2004 | *Guam Territorial Convention1
*Iowa District Conventions
*Kansas State Convention | |
| Tuesday 27 April 2004 | *Pennsylvania Primary1 | *Pennsylvania Primary |
| Thursday 29 April 2004 | *District of Columbia State Committee | |
| Thursday 29 April - Saturday 1 May 2004 | | *Nevada District Meetings and State Convention |
| Saturday 1 May - Saturday 22 May 2004 | | *Minnesota District Conventions |
| Tuesday 4 May 2004 | *Indiana Primary1 | *Indiana Primary |
| Thursday 6 May - Saturday 8 May 2004 | | *Wyoming Convention |
| Friday 7 May - Saturday 22 May 2004 | | *Virginia District Conventions |
| Saturday 8 May 2004 | | *Arizona District Caucus and State Convention
*Utah State Convention |
| Tuesday 11 May 2004 | *Nebraska Primary1
*West Virginia Primary1 | *West Virginia Primary |
| Friday 14 May - Saturday 15 May 2004 | *Wyoming State Convention | *Illinois Convention
*Delaware State Convention |
| Friday 14 May - Friday 21 May 2004 | *Colorado District Conventions | |
| Saturday 15 May 2004 | *Michigan State Central Committee | *Maine District Caucuses and State Convention |
| Tuesday 18 May 2004 | *Arkansas Primary1
*Kentucky Primary1
*Oregon Primary1 | *Arkansas Primary
*Oregon Primary
*Kentucky Primary |
| Tuesday 18 May - Wednesday 19 May 2004 | | *New York State Committee |
| Thursday 20 May - Saturday 22 May 2004 | | *Alaska Convention |
| Thursday 20 May - Sunday 23 May 2004 | | *North Carolina State Convention |
| Friday 21 May - Saturday 22 May 2004 | | *Michigan Congressional District Caucuses and State Convention |
| Saturday 22 May 2004 | *North Carolina District Conventions
*Maine State Convention.
*Colorado State Convention | |
| Saturday 22 May - Saturday 5 June 2004 | | *Colorado District Conventions |
| Tuesday 25 May 2004 | | *Idaho Primary |
| Friday 28 May - Saturday 29 May 2004 | | *Washington State Convention |
| Saturday 29 May 2004 | *Washington Congressional District Caucuses | |
| Sunday 30 May 2004 | *Hawaii State Convention | |
| Tuesday 1 June 2004 | *Alabama Primary1
*South Dakota Primary1 | *Alabama Primary
*New Mexico Primary
South Dakota Primary (cancelled) |
| Friday 4 June - Saturday 5 June 2004 | | *Pennsylvania State Committee
*Virginia State Conventions |
| Friday 4 June - Sunday 6 June 2004 | | *Hawaii State Convention |
| Saturday 5 June 2004 | *Virginia State Convention
*Washington State Convention | *Minnesota State Convention
*Colorado State Convention |
| Sunday 6 June 2004 | Puerto Rico Caucus (cancelled)1 | |
| Monday 7 June - Tuesday 8 June 2004 | | *Indiana State Convention |
| Tuesday 8 June 2004 | *Montana Primary1
*New Jersey Primary1 | *New Jersey Primary |
| Thursday 10 June - Saturday 12 June 2004 | | *Montana State Convention |
| Friday 11 June 2004 | | *Iowa State Convention District Caucuses |
| Saturday 12 June 2004 | | *Iowa State Convention |
| Thursday 17 June - Sunday 20 June 2004 | *Idaho State Convention | |
| Saturday 19 June 2004 | *Texas State Convention | |
| Saturday 26 June 2004 | *Iowa State Convention | *Nebraska State Convention |
