Ten provinces with most offender for the narcotics: 2009 - 2011
 2009 
RankProvincescase
1Bangkok54,288
2Chon Buri19,589
3Samut Prakan11,105
4Nakhon Pathom7,807
5Ratcha Buri5,747
6Nakhon Ratchasima5,652
7Kanchana Buri5,636
8Chiang Mai5,452
9Supan Buri5,135
10Ubon Ratchathani5,099
 ทั่วราชอาณาจักร247,760
 2010 
RankProvincescase
1Bangkok54,561
2Chon Buri21,602
3Samut Prakan11,956
4Nakhon Pathom8,576
5Ubon Ratchathani6,854
6Kanchana Buri6,503
7Surat Thani6,443
8Nakhon Ratchasima6,314
9Ratcha Buri6,159
10Chiang Mai5,792
 ทั่วราชอาณาจักร280,961
 2011 
RankProvincescase
1Bangkok73,025
2Chon Buri19,934
3Nakhon Ratchasima8,836
4Ratcha Buri8,533
5Ubon Ratchathani8,356
6Surat Thani8,213
7Nakhon Pathom8,126
8Samut Prakan7,857
9Nakhon Si Thammarat7,790
10Chiang Mai6,996
 ทั่วราชอาณาจักร342,602
Souce : The Royal Thai Police
Compiled by : Statistical Forecasting Bureau,  National Statistical Office