Ten provinces with  the highest number of population. : 2010 - 2012   2010     Rank Provinces Number % 1 Bangkok 5,701,394 8.93 2 Nakhon Ratchasima 2,582,089 4.04 3 Ubon Ratchathani 1,813,088 2.84 4 Khon Kaen 1,767,601 2.77 5 Chiang Mai 1,640,479 2.57 6 Buri Ram 1,553,765 2.43 7 Udon Thani 1,544,786 2.42 8 Nakhon Si Thammarat 1,522,561 2.38 9 Si Sa Ket 1,452,471 2.27 10 Surin 1,381,761 2.16   Whole Kingdom 63,878,267 100   2011     Rank Provinces Number % 1 Bangkok 5,674,843 8.86 2 Nakhon Ratchasima 2,585,325 4.03 3 Ubon Ratchathani 1,816,057 2.83 4 Khon Kaen 1,766,066 2.76 5 Chiang Mai 1,646,144 2.57 6 Buri Ram 1,559,085 2.43 7 Udon Thani 1,548,107 2.42 8 Nakhon Si Thammarat 1,526,071 2.38 9 Si Sa Ket 1,452,203 2.27 10 Surin 1,380,399 2.15   Whole Kingdom 64,076,033 100   2012     Rank Provinces Number % 1 Bangkok 5,673,560 8.80 2 Nakhon Ratchasima 2,601,167 4.04 3 Ubon Ratchathani 1,826,920 2.83 4 Khon Kaen 1,774,816 2.75 5 Chiang Mai 1,655,642 2.57 6 Buri Ram 1,566,740 2.43 7 Udon Thani 1,557,298 2.42 8 Nakhon Si Thammarat 1,534,887 2.38 9 Si Sa Ket 1,458,370 2.26 10 Surin 1,386,277 2.15   Whole Kingdom 64,456,695.00 100 Source : Department of Local Administration,Ministry of Interior Compiled by : Statistical Forecasting Bureau,  National Statistical Office