June 2026 Nixie Volume

This spreadsheet contains the UAA statistics for June 2026.

ZIP Codes by Area and District codes

The Excel spreadsheet lists ZIP Codes with the associated Area and District Codes.  

Informed Delivery® Post-Campaign (IDPC) Data through IV-MTR® Data Dictionary

This document describes the Informed Delivery Post-Campaign (IDPC) data fields available through the IV-MTR application.

Updated List: Service Type Codes for Intelligent Mail® Package Barcode (IMpb)

This document provides the updated service type codes for  Intelligent Mail® Package Barcodes.

Population Mobility Trends 12-Month Historical (CSV) Sample File

Occupancy Trends Congressional District Vacant File (TXT) Sample File

Occupancy Trends County Vacant File (TXT) Sample File

Occupancy Trends Route Vacant File (TXT) Sample File

Occupancy Trends ZIP Code Vacant File (TXT) Sample File

Population Mobility Trends Summary (CSV) Sample File

Population Mobility Trends 48-Month Historical (CSV) Sample File

April 2026 Nixie Volume

This spreadsheet contains the UAA statistics for April 2026.

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Operation Codes List

This spreadsheet provides a list of operation codes (opcodes), also known as Scan Event Codes, for the IV-MTR application.

PTR Domestic Scan Events and Descriptions

Labeling List Changes Effective May 1, 2026

Effective May 1, 2026, the Postal Service™ will revise Labeling List(s) L007, L012, L014, L016, L051, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the May 1, 2026, effective date through June 30, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22700.

February 2026 Nixie Volume

This spreadsheet contains the UAA statistics for February 2026.

Undeliverable-as-Addressed (UAA) Mail Roll-Up 1998-2025

Labeling List Changes Effective April 1, 2026

Effective April 1, 2026, the Postal Service™ will revise Labeling List(s) L002, L005, L007, L012, L016, L051, L201, and L606 to reflect changes in mail processing operations. Mailers are expected to label according to these revised lists for mailings inducted on or after the April 1, 2026, effective date through May 31, 2026, expiration date. The changes will be published in the Postal Bulletin, Issue #22698.

Pending Route Adjustment File

This Excel sheet details route adjustments for February 2026 thru April 2026.

January 2026 Nixie Volume

This spreadsheet contains the UAA statistics for January 2026.

ACS Tables: PARS 2025

This spreadsheet contains 12 tables outlining ACS volume and cost for UAA Mail from FY2025.