JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<form>
<input type="text"  placeholder="zip field" id="formFieldZip"/>  
<input type="text" placeholder="other form field"/>
</form>

JavaScript

$( document ).ready(function() {
     let inLA = false;
	   var zipsLA = ["700, 701, 703, 704, 705, 706, 707, 708, 710, 711, 712, 713, 714"];
		const $zipField = document.getElementById('formFieldZip')
		const $zipValue = document.getElementById('formFieldZip').value
   
    $zipField.addEventListener('blur', function(){
        console.log($zipField.value);
    });
});