Home / Massachusetts ZIP Codes / ZIP Code 02451

ZIP code 02451 belongs to Waltham, Massachusetts, in Middlesex. If you are mailing a letter or package to this area, use Waltham, MA 02451 in the address. On this page you will find the city and county for 02451, nearby ZIP codes in the same county, and free tools to look up any address in this ZIP code.

What City Is ZIP Code 02451?

The city for ZIP code 02451 is Waltham, Massachusetts. When you write an address in this area, the correct format is: Name, Street Address, Waltham, MA 02451.

ZIP Code 02451 County and State

ZIP code 02451 is located in Middlesex, Massachusetts. For a complete list of cities and ZIP codes across the state, see the Massachusetts ZIP Codes page.

Nearby ZIP Codes in Middlesex

These ZIP codes are in the same county as 02451:

ZIP Code 02451 on the Map

The map below shows the approximate center of ZIP code 02451, near Waltham, Massachusetts. You can zoom in and drag the map to explore the area.

Map center is approximate (ZIP area center, around 42.3986, -71.2451). Map data © OpenStreetMap.

Population and Demographics of ZIP Code 02451

According to public U.S. Census Bureau data, ZIP code 02451 is home to a community in Massachusetts. The figures below come from the U.S. Census and the American Community Survey (ACS).

Source: U.S. Census Bureau, American Community Survey (ACS) 2023 5-year estimates and 2023 Gazetteer. Figures are estimates and change with each new survey.

Find an Address in ZIP Code 02451

Need the full ZIP+4 code for a specific street address in Waltham? Use the free ZIP+4 Lookup tool, or find any ZIP code from a street address with the ZIP Code by Address tool.

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