Ten provinces with most vehicle registration: 2009 - 2011   2009     Rank Provinces Number % 1 Bangkok 5,954,454 22.68 2 Chiang Mai 915,282 3.49 3 Chon Buri 910,333 3.47 4 Nakhon Ratchasima 895,196 3.41 5 Songkhla 625,398 2.38 6 Khon Kaen 560,329 2.13 7 Nakhon Si Thammarat 496,475 1.89 8 Chiang Rai 495,553 1.89 9 Surat Thani 489,532 1.86 10 Ubon Ratchathani 481,082 1.83   Whole Kingdom 26,258,235 100   2010     Rank Provinces Number % 1 Bangkok 6,294,423 22.86 2 Chiang Mai 970,127 3.52 3 Chon Buri 963,065 3.50 4 Nakhon Ratchasima 938,180 3.41 5 Songkhla 649,790 2.36 6 Khon Kaen 591,571 2.15 7 Chiang Rai 525,128 1.91 8 Nakhon Si Thammarat 516,703 1.88 9 Ubon Ratchathani 509,800 1.85 10 Surat Thani 506,620 1.84   Whole Kingdom 27,530,042 100   2011     Rank Provinces Number % 1 Bangkok 6,692,471 22.92 2 Chiang Mai 1,033,426 3.54 3 Chon Buri 1,030,421 3.53 4 Nakhon Ratchasima 1,001,625 3.43 5 Songkhla 699,830 2.40 6 Khon Kaen 633,492 2.17 7 Nakhon Si Thammarat 557,485 1.91 8 Chiang Rai 556,810 1.91 9 Ubon Ratchathani 548,904 1.88 10 Surat Thani 544,914 1.87   Whole Kingdom 29,204,511 100 Souce : Department of Land Transport, Ministry of Transport Compiled by : Statistical Forecasting Bureau,  National Statistical Office