| | 2009 | | | | Rank | Provinces | Offices | % | | 1 | Bangkok | 1,944 | 33.49 | | 2 | Chon Buri | 293 | 5.05 | | 3 | Samut Prakan | 216 | 3.72 | | 4 | Chiang Mai | 196 | 3.38 | | 5 | Nonthaburi | 193 | 3.32 | | 6 | Pathum Thani | 166 | 2.86 | | 7 | Surat Thani | 132 | 2.27 | | 8 | Phuket | 122 | 2.10 | | 9 | Nakhon Ratchasima | 114 | 1.96 | | 10 | Songkhla | 111 | 1.91 | | | Whole Kingdom | 5,805 | 100 |
| | | 2010 | | | | Rank | Provinces | Offices | % | | 1 | Bangkok | 2,010 | 33.63 | | 2 | Chon Buri | 298 | 4.99 | | 3 | Samut Prakan | 211 | 3.53 | | 4 | Chiang Mai | 200 | 3.35 | | 5 | Nonthaburi | 197 | 3.30 | | 6 | Pathum Thani | 170 | 2.84 | | 7 | Surat Thani | 130 | 2.18 | | 8 | Phuket | 125 | 2.09 | | 9 | Nakhon Ratchasima | 121 | 2.02 | | 10 | Songkhla | 114 | 1.91 | | | Whole Kingdom | 5,977 | 100 |
| | | 2011 | | | | Rank | Provinces | Offices | % | | 1 | Bangkok | 2,078 | 33.51 | | 2 | Chon Buri | 310 | 5.00 | | 3 | Samut Prakan | 212 | 3.42 | | 4 | Nonthaburi | 203 | 3.27 | | 5 | Chiang Mai | 201 | 3.24 | | 6 | Pathum Thani | 174 | 2.81 | | 7 | Surat Thani | 134 | 2.16 | | 8 | Phuket | 128 | 2.06 | | 9 | Nakhon Ratchasima | 125 | 2.02 | | 10 | Songkhla | 122 | 1.97 | | | Whole Kingdom | 6,201 | 100 |
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