Phitsanulok is a city in Northern Thailand, the capital of Phitsanulok province and the tenth-largest city in Thailand. It is 360 km north of B…Phitsanulok is a city in Northern Thailand, the capital of Phitsanulok province and the tenth-largest city in Thailand. It is 360 km north of Bangkok and has a population of 281,929 people as of 2021. The city was founded in the 13th century under the name Song Khwae and represents one of the oldest cities in Thailand.