When the LEA send out the offer letters they send an accompanying sheet/leaflet that lists all the primary schools in the county alphabetically. It gives the PAN for each school and then either how many reception spaces they have (based on offers made) or how many they were oversubscribed by.
Obviously only parents with a child due to reception this Sept get that leaflet in the post. Is there any other way of seeing that info for the county? Can you ask for a copy?