ATTENTION BANGKOK MEMBERS:
Counter Choice at Muang Thong Thani Immigration office.
IF you BOUGHT a tourist visa from a thai consulate before you came here and when you arrived you were stamped in for 60 days you use COUNTER J
IF you didn't buy ANY visa before you came here and when you arrived you were stamped in FREE for 30 days you use COUNTER K <- This is the counter that is JAMMED packed with people.
We advise no matter what counter you use book an appointment at this website IF you can before you go.
TLDR : Answer Summary
At Muang Thong Thani Immigration Office in Bangkok, the process differs based on your visa situation. If you've obtained a tourist visa from a Thai consulate before arrival, you should go to Counter J, where you are stamped in for 60 days. Conversely, if you did not acquire any visa beforehand, you should head to Counter K, which is usually very crowded, as you will be stamped in for free for 30 days. It's advisable to book an appointment online in advance, regardless of which counter you choose to minimize wait times.