Mechinagar Municipality initially originated by combining Dhulabari (Nepali: धुलाबारी) and Kakarbhitta Village Development Committee.

The municipality got its first territorial expansion by merging with nearby VDCs Bahundangi, Duhagadhi, Jyamirgadhi and Dhaijan in 2073 BS (2017 AD).

The city has Arjundhara Municipality and Birtamod in the Western Part, Buddha Shanti Gaupalika and Ilam District in the North, Bhadrapur, Mechi in the South and West Bengal, India in the East.

Of these, 63.5% spoke Nepali, 8.7% Rajbanshi, 3.6% Limbu, 3.5% Maithili, 2.6% Rai, 2.6% Tamang, 1.8% Mech, 1.8% Newar, 1.5% Santali, 1.4% Magar, 1.2% Dhimal, 0.8% Rajasthani, 0.8% Urdu, 0.7% Kisan, 0.7% Tharu, 0.6% Gurung, 0.4% Bengali, 0.4% Bhojpuri, 0.4% Danwar, 0.4% Hindi, 0.4% Uranw/Urau, 0.3% Bantawa, 0.3% Sherpa, 0.2% Chamling, 0.1% Dungmali, 0.1% Kharia, 0.1% Kulung, 0.1% Majhi, 0.1% Malpande, 0.1% Musalman, 0.1% Sunwar and 0.4% other languages as their first language.

[4] In terms of ethnicity/caste, 22.3% were Hill Brahmin, 18.6% Chhetri, 8.9% Rajbanshi, 5.1% Rai, 4.7% Limbu, 4.4% Newar, 4.3% Tamang, 3.9% Magar, 3.5% Kami, 2.0% Damai/Dholi, 1.9% Mech, 1.9% Sanyasi/Dasnami, 1.3% Dhimal, 1.3% Musalman, 1.3% Santal, 1.1% Tharu, 1.0% Gharti/Bhujel, 1.0% Gurung, 1.0% Marwadi, 0.8% Kisan, 0.8% Sarki, 0.7% Danuwar, 0.7% other Terai, 0.6% Jhangad/Dhagar, 0.5% Kathabaniyan, 0.4% Sherpa, 0.3% Bengali, 0.3% Majhi, 0.3% Munda, 0.3% Sunuwar, 0.3% Teli, 0.3% Yadav, 0.2% Terai Brahmin, 0.2% other Dalit, 0.2% Dhanuk, 0.2% Hajjam/Thakur, 0.2% other Janajati, 0.2% Kalwar, 0.2% Mallaha, 0.1% Bantawa, 0.1% Bantar/Sardar, 0.1% Chamling, 0.1% Dhobi, 0.1% Dom, 0.1% Halwai, 0.1% Kanu, 0.1% Kayastha, 0.1% Kewat, 0.1% Khawas, 0.1% Kulung, 0.1% Kumal, 0.1% Musahar, 0.1% Pattharkatta/Kushwadiya, 0.1% Rajput, 0.1% Samgpang, 0.1% Sonar, 0.1% Sudhi, 0.1% Thakuri, 0.1% Thami, 0.1% Yakkha and 0.4% others.

[5] In terms of religion, 81.9% were Hindu, 6.4% Buddhist, 6.1% Kirati, 2.5% Christian, 1.2% Muslim, 1.2% Prakriti, 0.2% Jain and 0.5% others.

During March and April, high winds are likely to occur and moderate rainfall is seen in June and July.