//-->. Internet providers in Duncannon, PA. Find out what homes are worth in Duncannon, PA 17020. Duncannon is located at (40.393986, -77.028891). Using any city in the list of unacceptable cities may result in unforseen delays. Duncannon Pennsylvania Zip Codes for 2020 2019, Duncannon Pennsylvania Zipcodes for 2020 2019, Duncannon Pennsylvania Zip Codes for 2019, Duncannon Pennsylvania Zip Codes for 2020 Duncannon is located in Pennsylvania Latitude: 40.414171 Longitude: -77.041503 Check the list of Pennsylvania ZIP Code. (see all below). Geocode Utilities In the most recent US census the population of Duncannon was 1522. According to the United States Census Bureau, the borough has a total area of 0.4 square miles (1.0 km 2), all of it land. 11 River Rd , Duncannon, PA 17020 is a vacant lot listed for-sale at $175,000. City Est. /* Zipcodes LU 468x15 */ From $33. Each Duncannon Pennsylvania zip code has a center Longitude / Latitude point (the Duncannon center is -77.026702880859 / 40.395000457764). Find MoreCities in Pennsylvania that start with D, Post Office Suburb:DUNCANNON, PA, 17020-9998,