Usthi is a census town and a gram panchayat within the jurisdiction of the Usthi police station in the Magrahat I CD block in the Diamond Harbour subdivision of the South 24 Parganas district in the Indian state of West Bengal.

Diamond Harbour subdivision is a rural subdivision with patches of urbanization. Only 14.61% of the population lives in the urban areas and an overwhelming 85.39% lives in the rural areas. In the eastern portion of the subdivision (shown in the map alongside) there are 24 census towns. The entire district is situated in the Ganges Delta and the eastern part of the district is a flat plain area with small towns, many in clusters. Location of places in the larger map varies a little. It is an OpenStreetMap, while we are using coordinates as in Google Maps.

Note: The map alongside presents some of the notable locations in the subdivision. All places marked in the map are linked in the larger full screen map.

Usthi is located at 22°14′15″N 88°16′21″E / 22.2375°N 88.2724°E / 22.2375; 88.2724.

Usthi, Ghola Noapara, Barijpur and Uttar Kusum form a cluster of census towns in the Magrahat I CD block. Uttar Bishnupur, Kalikapota and Bamna are a little away from this cluster. This is as per the map of the Magrahat I CD block on page 445 in the District Census Handbook for South 24 Parganas.

According to the 2011 Census of India, Usthi had a total population of 6,230, of which 3,173 (51%) were males and 3,057 (49%) were females. There were 839 persons in the age range of 0–6 years. The total number of literate persons in Usthi was 4,483 (83.167% of the population over 6 years).

Usthi police station has jurisdiction over the Magrahat I CD block.

The headquarters of the Magrahat I CD block are located at Usthi.