Families with children in Year 6 have until midnight on 31 October to submit applications for next September.
Three preferred schools can be selected using an online tool to find schools in the local area.
Full details on the process can be found at the East Sussex County Council website
Cllr Bob Standley, the county council’s lead member for education and inclusion, special educational needs and disability, said: “Every year we see families whose children would have secured a place at their preferred school, if it were not for the fact that their application missed the deadline.
“Ensuring applications are submitted on time is really important to ensure that children have the best possible chance of getting a place at one of their preferred schools. From the 2023 applications received on time, 97 per cent were allocated one of their preferred schools.”