Siswar (सिसवार) is a village in the Phulparas block of Madhubani district, Bihar, in the easternmost reach of the district near the Kosi–Kamala plains and the Nepal border. The 2011 Census (village code 220095) recorded a population of about 9,441 across roughly 1,760 households; overall literacy was about 50%, with female literacy markedly lower — typical of the deep rural eastern Madhubani belt. Its post office serves PIN 847409, and it lies in the Laukaha assembly segment of the Jhanjharpur Lok Sabha constituency.
It is about 8–9 km from the block headquarters at Phulparas, with Khutauna the nearest railway station and Jhanjharpur, Nirmali and Ghoghardiha on the wider network; Madhubani town is some 43 km west. The Sakri and Kamala rivers drain the surrounding fields. Among the institutions recorded here are the Middle School Siswar and the B.D.S. High School, and the village keeps an active local identity online. (Note: a smaller, separate “Siswar” exists nearby under the Laukaha sub-division — this entry describes the larger Phulparas village, census code 220095.)
The community is Maithili-speaking and agrarian, set in the Mithila-painting heartland of Madhubani. As with many villages of this tract, the verifiable public record is largely administrative; its temples, ponds, fairs and family histories live chiefly in local memory rather than in print.