This legislation directs the United States Postal Service (USPS) to establish a single, unique ZIP Code specifically for the city of Eastvale, California. The primary purpose is to provide Eastvale with its own distinct postal identity, which can help address issues that may arise from sharing ZIP Codes with neighboring communities. The bill mandates that this new ZIP Code must apply exclusively to the geographic area encompassing Eastvale. The USPS is required to implement this designation within 180 days following the enactment of this section, ensuring a timely transition to the new postal arrangement.