For most priests it is a parish. But there are priests that look after other things and are not associated with a particular parish. Some work in chaplaincy roles in places like universities or hospitals or prisons. Some are members of an order that does not work in parishes, but work within their own community of priests. Some priests have official roles within a diocese.
The area of Percy Priest Lake is 57.465 square kilometers.
The area of Salmo-Priest Wilderness is 167.277 square kilometers.
The area of Boisset-Saint-Priest is 18.28 square kilometers.
The area of Saint-Priest-Taurion is 27 square kilometers.
The area of Saint-Priest-Palus is 10.64 square kilometers.
The area of Arpheuilles-Saint-Priest is 20.02 square kilometers.
The area of Priest Point Park is 1,270,712.9166336001 square meters.
The area of Saint-Priest-Ligoure is 41.13 square kilometers.
The area of Saint-Priest-d'Andelot is 8,170,000.0 square meters.
The area of Saint-Priest-Bramefant is 19.06 square kilometers.
Quite simply, he is called a priest.
A diocese is the local area of the Church led by a bishop.