Magento 2 Restrict Zip Code Extension - Cynoinfotech
https://www.cynoinfotech.com/product/restrict-zip-codes-magento-2-extension/
Magento 2 Restrict Zip Codes by Cynoinfotech lets admin restrict an order based on the zip codes and users to check the delivery availability.The Restrict Zip Codes Magento 2 extension enables users to check product availability for their location from the product page. They just need to enter the zip code and the Magento zip code checker checks for available locations and flashes an availability or unavailability message. If the product is unavailable, the full order checkout is prohibited from proceeding.