Founded in 1912, Branch 1439 of the National Association of Letter Carriers currently serves 220 active and 28 retired letter carriers. We represent letter carriers in the cities of Ontario and Rancho Cucamonga, California. Our roster of Branch Officers is as follows:
| Robert Ortiz | President |
| Harold Kelso | Vice President |
| Mark Lesch | Secretary |
| Dennis Martin | Treasurer |
| Carlos Jauregui | Alta Loma Steward |
| Richard Spears | Cucamonga Steward |
| Pedro Urena | Cucamonga Steward |
| Jose Lopez | Ontario Main Office Steward |
| Jose Aguilar | Ontario Main Office Steward |
| Alex Case | Ontario DT Station Steward |
| Luis Hernandez-Tello | Ontario Plaza Station Steward |
| Tom Anderson | Health Benefits Rep |
| James Worthy | Trustee |
| Sue St.Jean-Silva | Trustee |
| Dale Jordan | Trustee |
| Mark Lesch | 1439'er Editor |
| Mark Lesch | Web Page Slave |
Branch 1439 can be contacted in the following ways;
NALC Branch 1439
PO Box 3011
Ontario, CA 91761-0902
or;
NALC Branch 1439
PO Box 3354
Rancho Cucamonga, CA 91729-3354
760.951.8201
mlesch@linkline.com
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