[2] Lahan is so far one of the most developed towns of Siraha and is popular for Sagarmatha Chaudhary Eye Hospital.

Thadi (Nepali: ठाड़ी) or Thadi Viswaspatti is the main entry point for the district form India and a very old border town and a market place of Nepal in Siraha District bordering Indian town of Laukaha.

Shree Airlines operates daily flights between Rajbiraj and Kathmandu[5] Thadi in Siraha is a part of one of the agreed route for Mutual Trade and custom point between India and Nepal.

[11] Ethnicity/caste: 20.4% were Yadav, 7.5% Musalman, 6.3% Musahar, 6.0% Koiri/Kushwaha, 5.7% Chamar/Harijan/Ram, 4.8% Teli, 4.1% Tharu, 4.0% Goswami, 3.7% Dhanuk, 3.3% Dusadh/Paswan/Pasi, 2.7% Sudhi, 2.5% Mallaha, 2.2% Kewat, 2.2% Khatwe, 2.2% Tatma/Tatwa, 2.1% Halwai, 1.7% Danuwar, 1.4% Hajam/Thakur, 1.3% Baraee, 1.1% Magar, 1.1% Tamang, 1.1% other Terai, 1.0% Chhetri, 1.0% Kathabaniyan, 0.9% Hill Brahmin, 0.9% Dhobi, 0.7% Badhaee, 0.6% Kami, 0.6% Kurmi, 0.5% Terai Brahmin, 0.5% Kalwar, 0.5% Newar, 0.5% Sonar, 0.3% Bantar/Sardar, 0.3% Gaderi/Bhedihar, 0.3% Kayastha, 0.3% Kumhar, 0.3% Rai, 0.3% Rajput, 0.2% Bin, 0.2% Damai/Dholi, 0.2% Dom, 0.2% Jhangad/Dhagar, 0.2% Majhi, 0.2% Marwadi, 0.2% Sanyasi/Dasnami, 0.2% Sarki, 0.2% Sunuwar, 0.1% Bengali, 0.1% Gharti/Bhujel, 0.1% Halkhor, 0.1% Kumal, 0.1% Lohar, 0.1% Mali, 0.1% Punjabi/Sikh, 0.1% Thakuri and 0.2% others.

[14] English and Nepali are two major medium of written and spoken languages used in schools and public and government offices.