If you live in Wiltshire you must apply to Wiltshire County Council for a school place even if you are applying for a school outside the county. Wiltshire's admissions team will pass the information on to the appropriate authority.
If you live in Wiltshire and would like information about secondary schools in neighbouring counties you can contact the Choice Advice Service at ask or you can contact the appropriate admissions team directly.
If you wish to apply for a place at a Wiltshire school but live in another county you must apply to the admissions team where you live, in accordance with their admissions policy and before their deadline. They will then pass your information on to Wiltshire.
If you are unsure which county a school is in or which authority it is maintained by you can check on the governments' schools finder website which has details of every school in the country.