Most/all states track incidents on race tracks within the state. It may not be easy to find out the information and it may not be in a nice spreadsheet format such as the example from New York but the data is tracked.
The Jockey Club also has their Equine Injury Database (EID) which has been collecting data since 2008.
There are links from there on tracks and what the tracks report to the EID. The EID’s focus is all race related fatalities (die or euthanized as a direct result of injuries sustained participating in a race or within 72 of such race).