Mangaldai Municipal Board was constituted in the year 1957 under the Chairmanship of the Dr. Ratneswar Saharia with 10 nos of wards.
Presently the Board is formed with 10(Ten) Nos. of wards. The office of the Chairman of the Board is situated in the Ward No.1 by the side of the National High Way-52 (Presently No.15).
The office of the Municipal Board is covered with an area of 01 Bighas 4 Katha 10 Lassa of Mangaldai Town which is the District Head Quarter of Darrang of Darrang District created in the year 1983. The river Mangaldai and its tributary Bega River are flowing through the Mangaldai Municipal area. The boundary of Mangaldai Municipal Board is as follows.
North Residential area .

1. South NH-52 (Presently No.15).
2. East P.W.D. State Road Division.
3. West Mangaldai Nagar Balak LP School.

The Board derives its revenue as follows:-

1. House Holding Tax .
2. Market /parking rates ( yearly.)
3. Room Rent (Monthly.)
4. Trade Licence (Yearly.)
5. Bheti/Land (Yearly.)
6. Fishery ( Year terms.)
7. Riksha/Thela//Cycle (Yearly.)
8. Construction of building permission.
9. MiSC. (Tower)

Education Institution:-

1. Mangaldai B.Ed College.
2. Mangaldai Commerce College.
3. Mangaldai College.
4. Mangaldai Law College.
5. Mangaldai Girls (private) College.
6. Mangaldai Govt H.S. School.
7. Mangaldai Girls H.S. School.
8. Mangaldai Town High School.
9. Mangaldai Vidyapith/Santipur H.S. School.
10. Mangaldai Boys LP. School/Girls LP. School, Bhabasankar Lp/SantipurLP/Tengabari LP/Santipur LP/Uttar Mangaldai LP, Bheberghat LP School.

Private Education Institution:-

1. Donbosco High School.
2. Ranjit Sarma Accademy.
3. Briliant Accademy.
4. Darrang Accademy.
5. North Accademy.

The National High Way 52 (Now 15) and Mangaldai Bhutiachang PWD Road are passing through Mangaldai Municipal town area east and north respectively. The Mangaldai Patharighat PWD Road and Mangaldai Mazikuchi are also passing though Mangaldai Municipal area.
The following are the main road within Municipal Board area which is maintained by the Municipal Board are:-

1. L.N.B. Road.
2. M.G. Road.
3. B.R. Road.
4. B.B. Road.
5. M. Ibrahim ALI Path.
6. Jagabandhu Path.
7. Suklal Ghosh Path.
8. H. Ch. Borah Path.
9. Dr. Dinesh Dey Path.
10. Bipin Medhi Path.
11. Mozamil Path.
12. Natya Mandir Path.
13. Anil Bora Path.
14. Lohit Deka Path.
15. Denial Path.
16. Khajanagar Path.
17. Jyotinagar Path.
18. Lachit Nagar Path.
19. New Colony Path.
20. Faraz nagar path.
21. Ananda Nagar Path.
22. Jitandra Nagar Path
23. Bhaba Baruah Path
24. Suriya Nagar Path
25. Sonali Pam Path
26. Karimeri Path
27. Laxmi Path
28. Preeti Nagar Path
29. Purana Kabarsthan Path

The Mangaldai Pathrighat Road and Mangaldai Mazikuchi Road are also passing through the Municipal Board area.

Banks and other business Establishments:-

The following banks & other establishments are located within Mangaldai Municipal area and are functioning.

1. State Bank of India.
2. Apex Bank.
3. Unaitted Commercial Bank.
4. Union Bank.
5. Central Bank of India
6. Gramin Vikash Bank.
7. Bank of India.
8. Axis Bank.
9. Punjab National Bank.
10. I.C.I.C.I Bank.
11. U.B.I.Bank.
12. H.D.F.C. Bank.
13. Mangaldai Nagar Samabai Bank.
14. Canara  Bank.
15. Allahabad Bank.

Other Establishments:-

1. L.I.C.I
2. National Insurance Comp.
3. Birla Sun Life.

Mangaldai is the largest city of Darrang district. It was named after Mangaldahi, who was the daughter of the Rajah of Darrang and was married to Pratap Singha, a ruler of the Ahom kingdom. Mangaldoi serves as the district's headquarters, and is an important trading centre for agricultural products. The Mangaldai is located at 26.43’ N 92.03’E. It is about 68 km by road from Guwahati. The Town is beautiful located on the Brahmaputra valley. Mangaldai is a head quarter of Darrang District. It has one National Park known as Orang National Park distance from Mangaldai to Orang National Park is 34 kilometres it situated at East side of Mangaldai. 
The current population of the town is 25835 persons out of which 51.0% are male and 49.0% are female. The town has a decadal growth of 8.01% during the period of 2001-2011 Census.
The total literacy rate of the town is 92.57%. The male literacy rate of the town is 94.95% against a female literacy rate of 90.09%.

The name Darrang was derived from the Bodo ward Darrang which mean ‘Lilabhumi’ (Playground) of gods. According to scholar Late Dineswar Sarma the ward Darrang come from Dawrang which means gate , as there was direct entry to Bhutan and from there to Nepal, China etc. Gradually this was known Darrang. Darrang district occupies an area of 3,481 square kilometres.  According to the 2011 census Darrang district has a population of 908,090. This gives it a ranking of 463rd in India (out of a total of 640). The district has a population density of 491 inhabitants per square kilometre (1,270 /sq mi) . Its population growth rate over the decade 2001-2011 was 19.51%. Darrang has a sex ratio of 923 females for every 1000 males and a literacy rate of 64.55%. 868,532 (57.74%) are Hindus, 534,658 (35.54%) are Muslims, and 97,306 (1.75%) are Christians.