US SB3657

Prohibits closure of post offices located more than 15 miles from another post office or serving as the closest post office for populations of 15,000 or more individuals

Requires USPS to hold public hearings (in-person or virtual) during the 60-day notice period before any post office closure, with hearing summaries published online within 7 days and a 180-day waiting period after publication before closure can occur

Blocks closure or consolidation of processing and distribution centers in any state if it would leave a geographically non-contiguous region with over 100,000 residents without a center

Prohibits closures of processing centers in USPS districts that failed to meet delivery benchmarks in the prior year (93% on-time for 2-day mail, 90.3% for 3-5 day mail), and requires Postal Regulatory Commission advisory opinions within 120 business days before any facility changes can be implemented

Bars USPS from implementing local or regional transportation optimization changes that reduce mail pickup or drop-off frequency at post offices without Postal Regulatory Commission approval