This "at a glance" look at the primary in each State simply lists the winner (and, in many cases, the candidate who came in second) in each Primary in chronological order.
boldface followed by (inc) indicates the incumbent
| Date | State |  Democrat |
 Republican |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| R | Winner | % | Second | % | R | Winner | % | Second | % | ||
| Tuesday 5 March 2024 | California Special | Schiff | 31 | Garvey | 34 | ||||||
| Top Two Primary | Top Two Primary | ||||||||||
| California | Schiff | 33 | Garvey | 32 | |||||||
| Top Two Primary | Top Two Primary | ||||||||||
| Texas | Allred | D | Gutierrez | Cruz | |||||||
| Tuesday 12 March 2024 | Mississippi | Pinkins | U | Wicker | L | Burton | |||||
| Tuesday 19 March 2024 | Ohio | Brown (inc) | U | Moreno | N | Dolan | |||||
| Tuesday 2 April 2024 | Mississippi | R | R | ||||||||
| Tuesday 23 April 2024 | Pennsylvania | Casey (inc) | U | McCormick | U | ||||||
| Tuesday 7 May 2024 | Indiana | McCray | L | Carmichael | Banks | U | |||||
| Tuesday 14 May 2024 | Maryland | Alsobrooks | D | Trone | Hogan | L | Ficker | ||||
| Nebraska Special | Love | U | Ricketts | ||||||||
| Nebraska | write-in candidate | Fischer | |||||||||
| West Virginia | Elliott | 45 | Shrewsbury | 36 | Justice | L | Mooney | ||||
| Tuesday 28 May 2024 | Texas | ||||||||||
| Tuesday 4 June 2024 | Montana | Tester (inc) | Sheehy | L | Johnson | ||||||
| New Jersey | Kim | L | Campos-Medina | Bashaw | 46 | Serrano Glassner | 39 | ||||
| New Mexico | Heinrich (inc) | U | Domenici | U | |||||||
| Tuesday 11 June 2024 | Maine | Costello | P | Kouzounas | U | ||||||
| Nevada | Rosen (inc) | Brown | D | Gunter | |||||||
| North Dakota | Christiansen | U | Cramer (inc) | U | |||||||
| Tuesday 18 June 2024 | Virginia | Kaine (inc) | C | Cao | L | Parkinson | |||||
| Tuesday 25 June 2024 | New York | Kennedy (inc) | P | Marecki | P | ||||||
| Utah | Gleich | P | Curtis | N | Staggs | ||||||
| Tuesday 30 July 2024 | Arizona | Gallego | U | Lake | D | Lamb | |||||
| Thursday 1 August 2024 | Tennessee | Johnson | L | Bradshaw | Blackburn (inc) | ||||||
| Tuesday 6 August 2024 | Michigan | Slotkin | Rogers | L | Amash | ||||||
| Missouri | Kunce | L | May | Hawley (inc) | U | ||||||
| Washington | Cantwell (inc) | D | Garcia | ||||||||
| Top Two Primary | Top Two Primary | ||||||||||
| Saturday 10 August 2024 | Hawaii | Hirono (inc) | McDermott | N | Lam | ||||||
| Tuesday 13 August 2024 | Connecticut | Murphy (inc) | P | Corey | D | Smith | |||||
| Minnesota | Klobuchar (inc) | White | 39 | Fraser | 29 | ||||||
| Vermont | Sanders (inc) | U | Malloy | U | |||||||
| Wisconsin | Baldwin (inc) | U | Hovde | ||||||||
| Tuesday 20 August 2024 | Florida | Mucarsel-Powell | L | Campbell | Scott (inc) | ||||||
| Wyoming | Morrow | U | Barrasso (inc) | L | Rasner | ||||||
| Tuesday 3 September 2024 | Massachusetts | Warren (inc) | U | Deaton | L | Antonellis | |||||
| Tuesday 10 September 2024 | Delaware | Rochester | P | Hansen | P | ||||||
| Rhode Island | Whitehouse | Morgan | L | McKay | |||||||
Key
- If a candidate wins 75.5% or more of the primary vote, the second place finisher is not listed.
- U means that this candidate ran in the primary unopposed (that is, with no other candidates appearing on the ballot but him/her). Please note that write-ins do NOT count as such "other candidates on the ballot" but the appearance of "Uncommitted" (or equivalent, such as "None of the Above") on a ballot DOES.
- L indicates a landslide majority [60.5 to 75.4% of the primary vote] for the winner.
- D indicates a decisive majority [52.5 to 60.4% of the primary vote] for the winner.
- N indicates a narrow majority [50.0(+1 vote) to 52.4% of the primary vote] for the winner.
- Where a winning (or, in a runoff State, leading) candidate has failed to gain at least a majority of the primary vote, the winner(leader) of the primary and the candidate who came in second are both listed with their respective percentages of the primary vote rounded up or down to the nearest whole integer.
- C indicates the Party's nominee was chosen by a Party-run process other than the Primary (State Convention, Party Central Committee or equivalent).
- P indicates Primary cancelled / nomination by default because nominee was the only candidate to have filed for this Party's Primary for this office. P also applies to nominees-to-be by apparent Party consensus (i.e. no opposition at an ensuing Convention).
- R indicates any Runoff which has been scheduled for this date.
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