Politics1 has this very useful chart, showing which presidential candidates are on the ballot in each state. The chart also includes write-in filing. Of course, the deadline for filing for write-in status in most states is still in the future, so that part of the chart isn’t complete.
It is very difficult to be perfectly accurate. BAN believes the Politics1 chart, as last updated on September 14, has these errors: for Stewart Alexander, Ohio should be shown as on, and Iowa should not be shown as on. For Virgil Goode, Kansas and Oregon should not be shown as on, and New Hampshire should have a question mark. For the list of those candidates who don’t fit on the chart: for Colorado, Randall Terry only has write-in status so his name should not be in bold; for Utah, Nelson Keyton only has write-in status so his name should not be in bold; for Louisiana, Andre Barnett should not be listed. Also Kansas should list Chuck Baldwin. Although it is conceivable that the Kansas Reform Party could still change its nomination from Baldwin to Goode, this appears very unlikely.
There are four presidential candidates who are on the ballot in three states: Roseanne Barr, Tom Hoefling, Merlin Miller, and Randall Terry. The chart gives Barr and Hoefling their own column but puts the other two at the bottom of the chart.
There are 27 individuals who are running for President and who are listed on the ballot in at least one state. The previous record was 23, which occurred in both 2008 and 1992. For purposes of this statistic, when a party has a presidential candidate who doesn’t meet the constitutional qualifications to be President, and therefore has a stand-in in some states but not other states, that is counted as one candidate, not two. Thanks to Darryl Perry for the link.