Machhargawan is a panchayat in Bairia block in West Champaran district in Bihar, India. The pin code of Machhargawan is 845452. The area of Machhargawan lies in the district of Bettiah and has a Branch Post Office. Machhargawan officially lies in the postal division of West Champaran, postal region of Muzaffarpur and postal circle of Bihar.

The 4 main villages in Machhargawan panchayat are:

Machhargawan Bazaar is the main shopping center for the adjoining villages of the Jogapatti block.

26°54′23″N 84°22′51″E / 26.9064°N 84.3809°E / 26.9064; 84.3809