Already in last autumn the constituency boundary definitions announced in the Royal Gazette helped me to find out about newly created municipalities which were not discussed in any of the available board meeting transcripts. However with the list of all changes up to December 15 2009 from the Department of Local Administration (DOLA) I though I am up to date.
But again that was too much to hope, now there was again a constituency definition in the Royal Gazette for a municipality which according to all my previous sources should still be a TAO. It is the subdistrict municipality Bua Sawang (เทศบาลตำบลบัวสว่าง) in Sakon Nakhon province, which was upgraded and renamed from the TAO Sawang (องค์การบริหารส่วนตำบลสว่าง).
The election of the new municipal council and mayor took place on January 17, so it might be possible that this upgrade did happen after December 15, the cutoff date in the DOLA list. If only DOLA would publish updates to their lists more often, and not just once a year.