The city of Los Alamos is assigned specific ZIP Code(s) by the United States Postal Service (USPS) to make mail delivery accurate and efficient. A ZIP Code in Los Alamos helps identify the correct postal area, ensuring that letters, parcels, and packages reach the right neighborhood or post office without delay. For residents, businesses, and visitors, knowing the correct Los Alamos ZIP Code is important not only for mailing purposes but also for location-based services, navigation, and demographic reference.
| Post Office | Los Alamos |
| County | Los Alamos |
| State | New Mexico |
| ZIP Code | 87544 |
| Post Office | Los Alamos |
| County | Los Alamos |
| State | New Mexico |
| ZIP Code | 87545 |