Bang Sai district (1404)
{{Infobox settlement
| official_name = Bang Sai
| native_name = บางไทร
| native_name_lang = th
| settlement_type = District
| image_skyline = Bang Sai - Wat Choeng Len วัดเชิงเลน อยุธยา บางไทร (2025) - img 10.jpg
| image_alt =
| image_caption = {{ill|Wat Choeng Len (Bang Sai)|th|วัดเชิงเลน (จังหวัดพระนครศรีอยุธยา)}}
| image_map = Amphoe 1404.svg
| map_caption = District location in Phra Nakhon Si Ayutthaya province
| pushpin_map =
| pushpin_map_caption =
| subdivision_type = Country
| subdivision_name = Thailand
| subdivision_type1 = Province
| subdivision_name1 = Ayutthaya
| subdivision_type3 = Tambon
| subdivision_name3 = 23
| subdivision_type4 = Muban
| subdivision_name4 =
| seat_type = Seat
| seat = Bang Sai
| established_title = District established
| established_date =
| population_total = 19973
| population_as_of = 2000
| population_density_km2 = auto
| area_total_km2 = 150.7
| leader_title =
| leader_name =
| postal_code_type = Postal code
| postal_code = 13270
| blank_name_sec1 = Geocode
| blank_info_sec1 = 1404
| timezone = ICT
| utc_offset = +7
| coordinates = {{coord|14|12|46|N|100|29|54|E|type:adm2nd_region:TH|display=inline,title}}
| website =
| footnotes =
}}
Bang Sai ({{langx|th|บางไทร}}, {{IPA|th|bāːŋ sāj|pron}}) is a district (amphoe) in the southern part of Phra Nakhon Si Ayutthaya province, central Thailand. There is another district of Ayutthaya which shares the same romanization Bang Sai, but has a different spelling in Thai.
History
The district dates back to khwaeng Sena Noi, which became an amphoe in 1898. It was renamed Ratchakhram in 1923 as the name of central tambon. In 1925 the district office was relocated to tambon Bang Sai, which became the name of the district in 1939.{{cite journal|journal=Royal Gazette|volume=56|issue=ก|pages=354–364|script-title=th:พระราชกฤษฎีกาเปลี่ยนนามอำเภอ กิ่งอำเภอ และตำบลบางแห่ง พุทธศักราช ๒๔๘๒|url=http://www.ratchakitcha.soc.go.th/DATA/PDF/2482/A/354.PDF|archive-url=https://web.archive.org/web/20090219071714/http://www.ratchakitcha.soc.go.th/DATA/PDF/2482/A/354.PDF|url-status=dead|archive-date=February 19, 2009|date=April 17, 1939|language=Thai}}
Geography
Neighboring districts are (from the north clockwise) Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in of Ayutthaya Province, Sam Khok of Pathum Thani province, and Lat Bua Luang and Sena of Ayutthaya again.
The main water sources are Chao Phraya and Noi Rivers. The topography of Bang Sai is a lowland area, so it experiences flooding almost every year.
Administration
The district is divided into 23 sub-districts (tambons).
| class="wikitable sortable"
! No. ! Name ! Thai name | ||
| 1. | Bang Sai | บางไทร |
| 2. | Bang Phli | บางพลี |
| 3. | Sanam Chai | สนามชัย |
| 4. | Ban Paeng | บ้านแป้ง |
| 5. | Na Mai | หน้าไม้ |
| 6. | Bang Yi Tho | บางยี่โท |
| 7. | Khae Ok | แคออก |
| 8. | Khae Tok | แคตก |
| 9. | Chang Lek | ช่างเหล็ก |
| 10. | Krachaeng | กระแชง |
| 11. | Ban Klueng | บ้านกลึง |
| 12. | Chang Noi | ช้างน้อย |
| 13. | Homok | ห่อหมก |
| 14. | Phai Phra | ไผ่พระ |
| 15. | Kok Kaeo Burapha | กกแก้วบูรพา |
| 16. | Mai Tra | ไม้ตรา |
| 17. | Ban Ma | บ้านม้า |
| 18. | Ban Ko | บ้านเกาะ |
| 19. | Ratchakhram | ราชคราม |
| 20. | Chang Yai | ช้างใหญ่ |
| 21. | Pho Taeng | โพแตง |
| 22. | Chiang Rak Noi | เชียงรากน้อย |
| 23. | Khok Chang | โคกช้าง |
Population
Bang Sai has a population of about 50,000 people, most of whom are engaged in agriculture, and few of them work in the local industrial factories.{{cite web|url=https://www.thaipbs.or.th/program/Nicetomeetyou/episodes/96511|language=thai|date=2023-08-05|accessdate=2023-08-06|title=บางไทร|trans-title=Bang Sai|work=Thai PBS|author=Nice To Meet You}}