Postil is a populated place LOCATED WITHIN the City of Valparaiso. In turn, the City of Valparaiso is located within Okaloosa County.
Postil is located at latitude 30.479 and longitude -86.485.
Since Postil is located within the City of Valparaiso, all of the census and demographic data for residents of Postil are included as part of the information reported for City of Valparaiso in the "Profile" tab above.