Unfortunately, KSA is the only GCC country who doesn't accept GCC residents for visits (visa on arrival). The only way to visit Dammam is to get a drive-through visa to Bahrain. First you have to get a visit vist to Bahrain (which is done in 2 hours, they are very professional) and the other visa to Saudi which takes at least 4 days through a service agent (u r not allowed to deal with the Saudi embassy, don't know why)
Remember, u have to drive to Bahrain otherwise u will have to pay a fine when u exit from Saudi, and Bahrain is a nice place to visit and it's only 30 minutes from Khobar.
Unfortunately, KSA is the only GCC country who doesn't accept GCC residents for visits (visa on arrival). The only way to visit Dammam is to get a drive-through visa to Bahrain. First you have to get a visit vist to Bahrain (which is done in 2 hours, they are very professional) and the other visa to Saudi which takes at least 4 days through a service agent (u r not allowed to deal with the Saudi embassy, don't know why)
Remember, u have to drive to Bahrain otherwise u will have to pay a fine when u exit from Saudi, and Bahrain is a nice place to visit and it's only 30 minutes from Khobar.
Have a nice trip and drive safely