August 2018: This question is a popular one and the answer might surprise a lot of folks.
First, let us discern between the province itself and the provincial center, both of which are often interchangeably referred simply as “Prachuap” for short.
The province of Prachuap Khiri Khan actually has eight districts, including the provincial seat of the same name.
The most recent available official population figures for Prachuap Khiri Khan come from the Department of Provincial Administration (DOPA) who compile and report vital provincial, district, and sub-district level statistics through their Official Statistics Registration Systems, which can be queried online. (Thai language).
As of December, 2017, the population of Prachuap Khiri Khan Province จังหวัดประจวบคีรีขัน was 543,979 (274,877 women vs 269,102 men).
Click here for more details about Prachuap Khiri Khan province, including a breakdown of numbers by each district and municipality.
Meanwhile, the population of Prachuap Khiri Khan Provincial District อำเภอเมืองประจวบคีรีขัน was about 91,000, with about 18,000 living in the center of Prachuap Khiri Khan ‘town’ municipality, and the remaining just outside the central municipality boundaries. Click here for more details about Prachuap provincial district.
Also worth noting here is that the largest city of Prachuap Khiri Khan province, as measured by population is Hua Hin, which is home to no less than 63,000 residents registered within its municipality boundaries, in addition to another 47,000 living outside of the Hua Hin municipality boundaries, but still in Hua Hin district.
These figures of course don’t account for foreign residents, expats or long term tourists or workers, who aren’t necessarily registered in Thai house books. Definitely a topic to be explored in the near future.
Watch this space!