| Clue | Source | Date |
|---|---|---|
| Mail ctrs. | LA Times Daily | 16 Jul 2025 |
| Federal mail ctrs. | Commuter | 16 Feb 2024 |
| Main mail ctrs | LA Times Daily | 18 Oct 2022 |
| Mail ctrs | LA Times Daily | 12 Sep 2021 |
| Mail ctrs | The Washington Post | 12 Sep 2021 |
| Mailing centers, for short | Jonesin | 15 May 2018 |
| Mailing ctrs. | ||
| Mailing ctrs. | ||
| Mail ctrs. | ||
| Mail stations: Abbr. | ||
| Federal bldgs. | ||
| Postal abbreviations. |