Ongkharak District

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District location in Nakhon Nayok Province
District location in Nakhon Nayok Province
Coordinates: 14°7′17″N 101°0′14″E / 14.12139°N 101.00389°E / 14.12139; 101.00389Coordinates: 14°7′17″N 101°0′14″E / 14.12139°N 101.00389°E / 14.12139; 101.00389
Country Thailand
Province Nakhon Nayok
 • Total 486.4 km2 (187.8 sq mi)
Population (2005)
 • Total 58,294
 • Density 119.8/km2 (310/sq mi)
Time zone UTC+7 (ICT)
Postal code 26120
Geocode 2604

Ongkharak (Thai: องครักษ์, pronounced [ʔōŋ.kʰā.rák]) is a district (amphoe) in the western part of Nakhon Nayok Province, central Thailand.

Once King Chulalongkorn (Rama V) visited Mueang Nakhon Nayok. When he and his company arrived the area of Ongkharak District, one of the royal guard was sick and died. The king ordered a shrine built to commemorate his servant. Ongkharak means 'royal guard'.


The old district office of Ongkharak was in Tambon Bang O (now in Ban Na District). In 1889 King Chulalongkorn ordered built Khlong Rangsit that links the Chao Phraya and Nakhon Nayok Rivers. The water gate in the Chao Phraya River was named Chulalongkorn Water Gate (ประตูน้ำจุฬาลงกรณ์), and its corresponding gate in the Nakhon Nayok River was named Saovabha Bhongsi Water Gate (ประตูน้ำเสาวภาผ่องศรี). The district office was moved to nearby the 16th Khlong of Khlong Rangsit. Twenty years later, the office was moved to a place next to the Saovabha Bhongsi Water Gate. Now the district office is behind Saovabha Market, 500 m from the old office.


Neighboring districts are (from the northeast clockwise) Ban Na and Mueang Nakhon Nayok of Nakhon Nayok Province, Ban Sang of Prachinburi Province, Bang Nam Priao of Chachoengsao Province, Lam Luk Ka, Thanyaburi and Nong Suea of Pathum Thani Province.

The important water resources are the Nakhon Nayok River and Khlong Rangsit.


Srinakharinwirot University's, Ongkharak campus is in the district.


The district is divided into 11 sub-districts (tambon), which are further subdivided into 116 villages (muban). The township (thesaban tambon) Ongkharak covers parts of the tambon Ongkharak and Sai Mun. There are a further 11 tambon administrative organizations (TAO).

No. Name Thai name Villages Pop.
1. Phra Achan พระอาจารย์ 13 6,190
2. Bueng San บึงศาล 9 4,945
3. Sisa Krabue ศีรษะกระบือ 13 6,635
4. Pho Thaen โพธิ์แทน 9 4,330
5. Bang Sombun บางสมบูรณ์ 13 3,659
6. Sai Mun ทรายมูล 11 5,166
7. Bang Pla Kot บางปลากด 11 6,578
8. Bang Luk Suea บางลูกเสือ 12 3,708
9. Ongkharak องครักษ์ 7 7,302
10. Chumphon ชุมพล 8 4,733
11. Khlong Yai คลองใหญ่ 10 5,048

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