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A comment on We mailed one hundred letters to test the postal service. Parent comment
Look under Mailing Services Measurement Results: https://about.usps.com/what/performance/service-performance/
Each table for a service type has ~10 years worth of nationwide annual percent on-time delivery. It's harder to compare individual geographic areas (you can change the URL to go back a year or two, not sure where older reports are).
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Look under Mailing Services Measurement Results: https://about.usps.com/what/performance/service-performance/
Each table for a service type has ~10 years worth of nationwide annual percent on-time delivery. It's harder to compare individual geographic areas (you can change the URL to go back a year or two, not sure where older reports are).