Once you know your county and school district you can use the information available in the PA-40 instruction booklet or this link (PA School Districts & Codes by County) to get the necessary school district code for your PA-40 or PA-1000.nswer ID 381 | Published 12/03/2002 12:15 AM | Updated 03/09/2015 11:33 AM. There are a few ways to go about this process: 1  If you are a home-owner you can review your real estate (school property) tax bills, 2  You can contact your municipal (local) government, or.