Rayong's 2025 population is now estimated at 573,756. In 1950, the population of Rayong was 6,388. Rayong has grown by 7,109 in the last year, which represents a 1.25% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects . These estimates represent the Urban agglomeration of Rayong, which typically includes Rayong's population in addition to adjacent suburban areas.
| City | 2025 Pop. ↓ | Growth |
|---|---|---|
| Bangkok | 11,391,700 | |
| Chon Buri | 1,491,180 | |
| Samut Prakan | 1,393,410 | |
| Chiang Mai | 1,244,190 | |
| Songkhla | 1,030,550 | |
| Pathum Thani | 974,195 | |
| Nakhon Ratchasima | 821,187 | |
| Samut Sakhon | 616,533 | |
| Udon Thani | 604,163 | |
| Chiang Rai | 586,352 | |
| Nakhon Pathom | 567,386 | |
| Kalasin | 551,882 | |
| Surat Thani | 528,783 | |
| Ubon Ratchathani | 527,549 | |
| Lop Buri | 524,118 | |
| Buri Ram | 483,767 | |
| Lampang | 479,219 | |
| Phra Nakhon Si Ayutthaya | 470,442 | |
| Roi Et | 469,760 | |
| Phuket | 460,810 | |
| Ratchaburi | 438,953 | |
| Sakon Nakhon | 406,297 | |
| Chanthaburi | 406,188 | |
| Suphan Buri | 380,383 | |
| Lamphun | 338,166 | |
| Mueang Nonthaburi | 291,555 | |
| Hat Yai | 191,696 | |
| Pak Kret | 182,926 | |
| Si Racha | 178,916 | |
| Phra Pradaeng | 171,333 | |
| Khon Kaen | 147,579 | |
| Nakhon Si Thammarat | 120,836 | |
| Khlong Luang | 118,551 | |
| Phitsanulok | 103,427 | |
| Pattaya | 97,296 | |
| Yala | 93,558 | |
| Nakhon Sawan | 91,802 | |
| Ban Mai | 86,899 | |
| Bang Kruai | 78,305 | |
| Krathum Baen | 72,819 | |
| Saraburi | 67,763 | |
| Trang | 66,713 | |
| Sattahip | 65,444 | |
| Kanchanaburi | 63,699 | |
| Nong Khai | 63,609 | |
| Ban Lam Luk Ka | 60,700 | |
| Kamphaeng Phet | 58,787 | |
| Chaiyaphum | 58,350 | |
| Uttaradit | 58,313 | |
| Ban Pong | 57,559 | |
| Phra Phutthabat | 57,008 | |
| Chumphon | 55,835 | |
| Klaeng | 55,619 | |
| Tha Maka | 52,907 | |
| Ban Talat Yai | 52,192 | |
| Maha Sarakham | 51,584 | |
| Phetchabun | 50,656 | |
| Hua Hin | 50,456 | |
| Ko Samui | 50,000 | |
| Chachoengsao | 49,741 | |
| Cha-am | 49,375 | |
| Pak Chong | 48,999 | |
| Narathiwat | 47,771 | |
| Pran Buri | 47,293 | |
| Surin | 46,673 | |
| Phetchaburi | 46,601 | |
| Chum Phae | 46,335 | |
| Sadao | 46,236 | |
| Si Sa Ket | 44,751 | |
| Mae Sot | 44,563 | |
| Pattani | 43,690 | |
| Phatthalung | 43,522 | |
| Warin Chamrap | 43,102 | |
| Su-ngai Kolok | 42,776 | |
| Tha Yang | 42,602 | |
| Ban Phaeo | 41,904 | |
| Bang Bua Thong | 41,567 | |
| Nong Khae | 41,067 | |
| Mukdahan | 40,480 | |
| Ban Na | 40,174 | |
| Bang Lamung | 39,620 | |
| Wichian Buri | 39,272 | |
| Wichit | 38,701 | |
| Phrae | 38,538 | |
| Mae Chan | 37,672 | |
| Sam Phran | 37,115 | |
| Sukhothai | 37,000 | |
| Kantharalak | 36,621 | |
| Photharam | 36,248 | |
| Phichit | 35,760 | |
| Det Udom | 35,669 | |
| Ban Phai | 35,583 | |
| Tha Bo | 35,292 | |
| Loei | 35,273 | |
| Samut Songkhram | 35,065 | |
| Kathu | 34,835 | |
| Amnat Charoen | 34,769 | |
| Nakhon Phanom | 34,595 | |
| Satun | 34,544 | |
| Nong Bua Lamphu | 34,401 | |
| Ban Ratsada | 33,534 | |
| Prachuap Khiri Khan | 33,521 | |
| San Kamphaeng | 32,950 | |
| Prachin Buri | 32,600 | |
| Krabi | 31,219 | |
| Ban Khlong Bang Sao Thong | 31,153 | |
| Yaring | 31,111 | |
| Na Klang | 31,024 | |
| Kaeng Khoi | 30,332 | |
| Betong | 29,604 | |
| Bang Phae | 29,548 | |
| Ban Phan Don | 29,211 | |
| Kaeng Khro | 29,056 | |
| Amphoe Sikhiu | 28,681 | |
| Sa Kaeo | 28,497 | |
| Bang Bo District | 28,376 | |
| Thung Song | 28,223 | |
| Ban Chang | 28,204 | |
| Ban Bang Kadi Pathum Thani | 27,911 | |
| Nong Phai | 27,756 | |
| Mae Sai | 27,520 | |
| Tha Muang | 26,746 | |
| Ron Phibun | 26,621 | |
| Ban Talat Bueng | 26,113 | |
| Si Satchanalai | 25,942 | |
| Tha Kham | 25,810 | |
| Bang Pakong | 25,620 | |
| Chai Badan | 25,196 | |
| Pak Phanang | 25,014 | |
| Kut Chap | 24,696 | |
| Nan | 24,670 | |
| Ranong | 24,561 | |
| Tak | 24,149 | |
| Dok Kham Tai | 23,824 | |
| Ban Bueng | 23,509 | |
| Kamalasai | 23,393 | |
| Ban Talat Nua | 23,381 | |
| Chok Chai | 23,337 | |
| Damnoen Saduak | 23,296 | |
| Tha Mai | 22,445 | |
| Uthai Thani | 22,219 | |
| Nang Rong | 21,961 | |
| Phanat Nikhom | 21,924 | |
| Ban Na San | 21,900 | |
| Taphan Hin | 21,895 | |
| Khanu Woralaksaburi | 21,889 | |
| Ban Nong Wua So | 21,722 | |
| Yasothon | 21,643 | |
| Trat | 21,590 | |
| Nakhon Nayok | 21,309 | |
| Phayao | 21,058 | |
| Kuchinarai | 20,532 | |
| Bang Pa-in | 20,484 | |
| Aranyaprathet | 20,236 | |
| Kabin Buri | 20,212 | |
| Sing Buri | 20,046 | |
| Phibun Mangsahan | 19,883 | |
| Sawankhalok | 19,805 | |
| Ranot | 19,780 | |
| Sam Roi Yot | 19,709 | |
| Ban Dung | 19,479 | |
| Phak Hai | 19,386 | |
| Nam Som | 19,324 | |
| Wiset Chaichan | 19,129 | |
| Tha Ruea | 19,116 | |
| Kui Buri | 19,046 | |
| Bang Krathum | 18,874 | |
| Phan Thong | 18,708 | |
| Khon Buri | 18,596 | |
| Kaset Wisai | 18,569 | |
| Khao Yoi | 18,506 | |
| Thoen | 18,459 | |
| Non Sung | 18,399 | |
| Ban Tak | 18,384 | |
| Ban Chalong | 18,072 | |
| Hang Dong | 17,931 | |
| Bang Len | 17,914 | |
| San Pa Tong | 17,773 | |
| Chon Daen | 17,567 | |
| Lat Yao | 17,506 | |
| Ban Phe | 17,414 | |
| Ban Selaphum | 17,412 | |
| Mae Ramat | 17,316 | |
| Lom Sak | 17,309 | |
| Tak Bai | 17,241 | |
| Phu Khiao | 17,122 | |
| Den Chai | 17,019 | |
| Nong Kung Si | 17,001 | |
| Kaset Sombun | 16,996 | |
| Ra-ngae | 16,862 | |
| Bang Rakam | 16,841 | |
| Bua Yai | 16,832 | |
| Sawang Daen Din | 16,825 | |
| Bo Phloi | 16,786 | |
| Thap Than | 16,615 | |
| Bang Ban | 16,588 | |
| Huai Yot | 16,586 | |
| Seka | 16,493 | |
| Wang Nam Yen | 16,299 | |
| Lang Suan | 16,142 | |
| Phu Kradueng | 16,079 | |
| Laem Sing | 16,066 | |
| Phanom Sarakham | 16,057 | |
| Ban Mo | 15,959 | |
| Wang Noi | 15,865 | |
| Wang Saphung | 15,747 | |
| Bang Mun Nak | 15,616 | |
| Pa Sang | 15,607 | |
| Dan Khun Thot | 15,580 | |
| Prakhon Chai | 15,564 | |
| Thap Khlo | 15,528 | |
| Chai Nat | 15,469 | |
| Ban Huai Thalaeng | 15,352 | |
| Bang Racham | 15,313 | |
| Phon Charoen | 15,208 | |
| Khao Wong | 15,184 | |
| Chom Bueng | 15,143 | |
| Bang Saphan | 15,134 | |
| Nakhon Luang | 15,008 | |
| Bamnet Narong | 14,890 | |
| Patong | 14,797 | |
| Doembang Nangbuat | 14,671 | |
| Phon | 14,596 | |
| Chiang Khong | 14,505 | |
| Ban Thai Tan | 14,430 | |
| That Phanom | 14,424 | |
| Pong | 14,392 | |
| Sung Noen | 14,365 | |
| Sai Buri | 14,356 | |
| Ban Su-ngai Pa Di | 14,274 | |
| Nong Bua | 14,160 | |
| Kantang | 14,156 | |
| Soeng Sang | 14,138 | |
| Chiang Kham | 14,092 | |
| Si Chiang Mai | 14,068 | |
| Bang Yai | 14,012 | |
| Lan Sak | 13,905 | |
| Ang Thong | 13,738 | |
| Pho Chai | 13,671 | |
| Pa Daet | 13,624 | |
| Rawai | 13,623 | |
| Bo Rai | 13,620 | |
| Nong Ki | 13,592 | |
| Bang Khla | 13,528 | |
| Kranuan | 13,475 | |
| Ban Sam Chuk | 13,438 | |
| Yang Talat | 13,360 | |
| Waeng | 13,317 | |
| Khlung | 13,286 | |
| Chaiyo | 13,255 | |
| Chiang Klang | 13,244 | |
| Phai Sali | 13,088 | |
| Phimai | 13,084 | |
| Na Wa | 12,989 | |
| Si Bun Rueang | 12,842 | |
| Chom Thong | 12,488 | |
| Phanom Thuan | 12,469 | |
| Don Sak | 12,422 | |
| Huai Mek | 12,352 | |
| Nakhon Thai | 12,345 | |
| Ban Nam Yuen | 12,335 | |
| Phayuha Khiri | 12,271 | |
| Chaiya | 12,223 | |
| Suwannaphum | 12,221 | |
| Nuea Khlong | 12,217 | |
| Pho Thong | 12,200 | |
| Rong Kwang | 12,087 | |
| Non Thai | 11,959 | |
| Wiang Sa | 11,933 | |
| Ko Pha Ngan | 11,846 | |
| Non Sang | 11,819 | |
| Long | 11,802 | |
| Phrai Bueng | 11,494 | |
| Satuek | 11,481 | |
| Nong Chik | 11,385 | |
| Khiri Mat | 11,272 | |
| Kham Sakae Saeng | 11,018 | |
| Chawang | 10,923 | |
| Chiang Saen | 10,807 | |
| Kosum Phisai | 10,672 | |
| Phayakkhaphum Phisai | 10,212 | |
| Wapi Pathum | 10,198 | |
| Ban Ko Kaeo | 10,136 | |
| Mae Tha | 10,048 |
