Published in the Royal Gazette on Saturday, the subdistrict administrative organization (TAO) Khao Noi, Prachuap Khiri Khan province was upgraded to a subdistrict municipality (เทศบาลตำบลเขาน้อย). I did not know about this before, as the site with the board meeting transcripts wasn't updated for quite some time, so the latest available is from September. I only noticed it shortly mentioned in the board meeting from August 9.
In this board meeting, the municipal boundaries between Khao Noi and Pran Buri were adjusted, making Pran Buri river the boundary between the two - except one small area, which is around the location of the municipality office of Khao Noi. Sadly this one isn't marked in the map within the announcement, only the district office and the land office of Pran Buri are found in there.