You can set Sort Order for the shipping address provider form field in Magento 2 using an XML file.
You need to create a checkout_index_index.xml file to apply sortOrder for the available fields.
You can’t able to do sortOrder for the street field using an XML file. (Street sortOrder is 70.)
File Path at Theme level, app/design/frontend/<VendorName>/<CompanyName>/Magento_Checkout/layout/checkout_index_index.xml
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="checkout.root">
<arguments>
<argument name="jsLayout" xsi:type="array">
<item name="components" xsi:type="array">
<item name="checkout" xsi:type="array">
<item name="children" xsi:type="array">
<item name="steps" xsi:type="array">
<item name="children" xsi:type="array">
<item name="shipping-step" xsi:type="array">
<item name="children" xsi:type="array">
<item name="shippingAddress" xsi:type="array">
<item name="children" xsi:type="array">
<item name="shipping-address-fieldset" xsi:type="array">
<item name="children" xsi:type="array">
<item name="firstname" xsi:type="array">
<item name="sortOrder" xsi:type="string">1</item>
</item>
<item name="lastname" xsi:type="array">
<item name="sortOrder" xsi:type="string">2</item>
</item>
<item name="city" xsi:type="array">
<item name="sortOrder" xsi:type="string">75</item>
</item>
<item name="postcode" xsi:type="array">
<item name="sortOrder" xsi:type="string">80</item>
</item>
<item name="region_id" xsi:type="array">
<item name="sortOrder" xsi:type="string">90</item>
</item>
<item name="country_id" xsi:type="array">
<item name="sortOrder" xsi:type="string">100</item>
</item>
<item name="telephone" xsi:type="array">
<item name="sortOrder" xsi:type="string">120</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</item>
</argument>
</arguments>
</referenceBlock>
</body>
</page>
You can change your sortOrder value based on your requirement.