Koh Mak has an area of 9,500 sq rai (16 sq km) of which 500 sq rai is public land. The remainder is made up of coconut and rubber plantations and is owned by 5 families. Three of these families can be traced back to the chinese ambassador.
There are 2 villages on Koh Mak "Ban Ao Nid" on the Easthern coast is home to 50 families and has a population of 210 and "Ban Laem Son" in the north of the island has 39 families with a population of 124. The total population of Koh Mak and the Koh Mak sub-district is nearly 900 this includes neighbouring islands Koh Rayang Nok, Koh Rayang Nai, Ko Pee, Koh Kham, and Koh Kradat. In total there are 21 islands, 9 habited and 12 uninhabited that make up the Koh Mak sub-district. Koh Mak is the 3rd largest after Koh Chang and Koh Kood.
Koh Mak is approximately 10 km from north to south and 5 km from east to west. The coastline is 26 km and has many beautiful white sand beaches. In particular the beaches of "Ao Suan Yai" on the west side and "Ao Kao" on the south side are long and deserted.
Most of the island is still covered by coconut and rubber plantations which is the island’s main export products. Many of the locals also make handicrafts from coconut shells, batik fabrics and furnitures. The oil extracted from coconuts can also be refined into a medical oil.
The majority of local people still work as farmers in the coconut and rubber plantations or as fisherman. There are 24 resorts on Koh Mak, this also generates employment for many of the local people.