Althorne which is located about 21 km (13 mi) east-southeast from the county town of Chelmsford. The village is in the district of Maldon district and in the parliamentary constituency of Maldon & East Chelmsford. The village has its own Parish Council. The civil parish has a population of 1104. Althorne is on the Dengie peninsula, about 5 km (3 miles) north-west of Burnham-on-Crouch.
Althorne is approximately 3 km (1.9 mi) north-west from the centre of Bridgemarsh Island in the River Crouch. The village of Althorne is connected to London, by the Southminster Branch Line, operated by Greater Anglia, which links Wickford to London Liverpool Street Station.
The railway station is Althorne railway station, though the station itself is cut adrift from the main village, only accessible from a long and steep track leading up to the edge of Althorne. There are no A roads close to the village - the main roads being the B1010 to Burnham and the B1018 road from Maldon to nearby Southminster.