These are the official forms for use in Nassau County Court proceedings. Proposed Short Form Commission for Art.The counties that share the same forms are grouped together. Looking for a faster and easy way to submit business? What is the Close Date on a job posting? How do I complete an online application? The Application Form is an online plugin template for HTML that helps you to make and operate custom forms for companies. How to fill out the Nassau County License Application Instructions? 1. Gather all required documents and photographs. 2. Download our most commonly requested forms.