If your church or ministry needs a Tax ID, the link to apply online is below. You can also print out and mail a form (Form SS-4).RP-420-a-Org (Fill-in), Instructions on form, Application for Real Property Tax Exemption for Nonprofit Organizations - Mandatory Class I - Organization Purpose. Welcome to the Suffolk County Clerk's Office. At one time or another either directly or indirectly, every resident of Suffolk County deals with our office. Several areas have an additional regional or local tax as outlined below. In the files I cannot find the official document where we were assigned the tax ID number. I need a copy of this document. You can download, print and fill out the Membership Application then mail it to us along with your payment and we will create your website Profile for you. How to apply for Medicaid.