| Official Name: | Tan Sum |
| Native Name: | ตาลสุม |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ubon Ratchathani |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Tan Sum |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 31164 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 34330 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 3420 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.3156°N 105.155°W |
Tan Sum (Thai: ตาลสุม, in Thai pronounced as /tāːn sǔm/) is a district (amphoe) in the central part of Ubon Ratchathani province, northeastern Thailand.
The minor district (king amphoe) Tan Sum was created on 18 September 1978, when the three tambons Tan Sum, Samrong, and Chik Thoeng were split off from Phibun Mangsahan district.[1] It was upgraded to a full district on 1 January 1988.[2]
The old name of the area was Tan Chum (ตาลชุม), which means fertile land with plenty by Toddy palm trees (Borassus flabellifer). Later the name was changed to Tan Sum.
Neighboring districts are (from the east clockwise) Si Mueang Mai, Phibun Mangsahan, Sawang Wirawong, Don Mot Daeng, and Trakan Phuet Phon of Ubon Ratchathani Province.
The important water resource are the Mun and Se Bok Rivers.
The district is divided into six sub-districts (tambons), which are further subdivided into 59 villages (mubans). Tan Sum is a township (thesaban tambon) which covers parts of tambon Tan Sum. There are a further six tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Tan Sum | ตาลสุม | 15 | 8,508 | ||
| 2. | Samrong | สำโรง | 8 | 3,778 | ||
| 3. | Chik Thoeng | จิกเทิง | 9 | 5,175 | ||
| 4. | Nong Kung | หนองกุง | 8 | 3,974 | ||
| 5. | Na Khai | นาคาย | 13 | 6,045 | ||
| 6. | Kham Wa | คำหว้า | 6 | 3,684 |
1. Tansum Phatthana SchoolTansum Phatthana School is a high school in Tansum County. It is located in Tansum, Ubon Ratchathani, a small town situated 40 km from the town. Students come from several small communities which are similar in economic status.