What town did aikido originate from?

Nobody knows for sure because Aikido is an art that has roots going back to the Japan Feudal Samurai period. However, O'Sensei, Morihei Ueshiba was the founder of "AikiJujutsu" to "Aikibudo" which was pre-war and then was changed to "Aikido" after world war 2. Ueshiba had private students and it is not clear how early on he was teaching. Ueshiba did train for years in Iwama, Japan.