Indonesian addresses follow a four level locality system of province, city/regency, district, and village. Addresses include the postcode of 5 digits after the locality name. Common address elements include street name, building number, sub-locality designations of RT/RW, and complex/housing names. Rural addresses may only include the village name and sub-locality details. Special cases exist for Jakarta which is a single province-level locality, and for post office boxes and poste restante deliveries.