Please see this thread from May 2023 about DX parks. It is even more relevant now that POTA has added many more parks in the United States some with 5-digit K-numbers.
Many loyal HAMRS users are hoping for the HAMRS internal database to get updated with the new park information soon.
Continuing the discussion from Park Lookup for newly added parks?:
Also, more user comments are here: New U.S. POTA Parks