^^^ You forgot about Singapore as a harpoon user. Harpoons are in operational service on RSN vessels, F-16C/Ds, Fokker 50 MPAs (on external hard points) and eventually, they will be in service with the 24 F-15SGs (o/o) once they reach FOC.
Edit: I see you have added us and I further confirm that it is in service on both our F-16s and Fokker 50 MPAs (see US DoD link on a
harpoon sale to Singapore in 1996). The RSAF has shown both of F-16s and Fokker 50 MPAs with harpoons in their open house to the Singapore public. Further, in Sept 2009 Air Forces Monthly article on the 425th FS (Singapore F-16 training detachment in the US), the article confirms that Singapore Viper drivers do train for a Maritime Strike role (see article in
post #15 in another thread).