Ten provinces with highest out-patients: 2004 - 2006
  2004  
Rank Provinces Out-patients
1 Nakhon Ratchasima 4,296,219
2 Khon Kaen 3,756,060
3 Udon Thani 3,225,897
4 Chiang Mai 3,110,157
5 Buri Ram 3,034,284
6 Surin 2,777,861
7 Nakhon Sawan 2,363,209
8 Songkhla 2,116,072
9 Chon Buri 2,071,070
10 Phra Nakhon Si Ayutthaya 2,014,639
  Whole Kingdom 100,058,309
  2005  
Rank Provinces Out-patients
1 Nakhon Ratchasima 5,011,805
2 Chiang Mai 4,170,516
3 Udon Thani 3,275,530
4 Khon Kaen 3,172,899
5 Buri Ram 2,993,364
6 Nonthaburi 2,841,774
7 Surin 2,423,554
8 Nakhon Sawan 2,316,238
9 Songkhla 2,256,035
10 Nakhon Si Thammarat 2,147,430
  Whole Kingdom 106,251,652
  2006  
Rank Provinces Out-patients
1 Nakhon Ratchasima 5,951,995
2 Chiang Mai 4,341,648
3 Khon Kaen 4,007,887
4 Udon Thani 3,329,008
5 Chiang Rai 3,179,442
6 Buri Ram 2,843,209
7 Surin 2,787,893
8 Ubon Ratchathani 2,420,367
9 Lampang 2,351,132
10 Nakhon Sawan 2,350,350
  Whole Kingdom 118,422,898
Source : Office of the Permanent Secretary for Public Health, Ministry of Public Health
Compiled by : Statistical Forecasting Bureau,  National Statistical Office