JSFiddle - React, Tailwind, and code Playground

HTML

<input id="SC5_zipR" name="sc5" type="radio" value="zip" />
<input id="SC5_cityR" name="sc5" type="radio" value="city" />
<input id="SC5_countyR" name="sc5" type="radio" value="county" />

JavaScript

.prop('checked', true);