If you’re moving, house-hunting, running a business, or just filling out online forms, understanding the Somerville MA postal code system can save you time and confusion. Somerville is compact but dense, and its ZIP codes often align with well-known neighborhoods like Davis Square, Union Square, Winter Hill, and Ten Hills.
While the city itself uses three primary Somerville ZIP codes — 02143, 02144, and 02145 parts of nearby ZIP codes (like 02138, 02140, and 02155) touch Somerville’s borders and sometimes show up in address tools. This guide breaks down every Somerville MA postal code by neighborhood, with practical examples and usage tips.
Quick Overview: All Somerville MA Postal Codes
Officially, the USPS associates three main ZIP codes with Somerville, MA as the preferred city name:
| ZIP Code | Primary City Name | Notes |
|---|---|---|
| 02143 | Somerville, MA | Central & eastern Somerville (Union Sq, Spring Hill, Prospect Hill) |
| 02144 | Somerville, MA | West Somerville (Davis Square, Teele Square, Ball Square) |
| 02145 | Somerville, MA | East/Northeast Somerville (Winter Hill, Ten Hills, Assembly Square) |
Data sources that use city boundaries (not just USPS data) also show overlapping ZIPs (02138, 02140, 02155) touching Somerville’s edges, mostly with Cambridge or Medford as the postal city.
What Is a Postal Code vs. Neighborhood?
Before we dive into each Somerville MA postal code, it helps to clarify the terms:
- Postal code / ZIP code:
A USPS-defined area for routing mail, which may not line up perfectly with neighborhood boundaries. - Neighborhood (square):
Informal but widely-used areas like Davis Square, Union Square, Magoun Square, or Assembly Square, defined more by local identity, real estate, and transit than by ZIP maps.
In Somerville, most neighborhoods sit mostly or entirely inside a single ZIP — but some squares are close to ZIP borders or partially shared.
02143 – Central & East Somerville (Union Square, Spring Hill & More)
ZIP Code: 02143
City (postal): Somerville, MA
Neighborhoods Commonly Associated with 02143
Sources that tie neighborhoods to 02143 list Spring Hill, Prospect Hill, and parts of Ward Two, along with Union Square as a major commercial hub.
You’ll typically find 02143 used for:
- Union Square – a lively restaurant and arts district, now served by the Green Line extension.
- Prospect Hill – residential streets climbing toward the historic Prospect Hill Monument.
- Spring Hill – classic triple-deckers and quiet residential blocks.
- Parts of Central Hill – between Highland Ave and Somerville High School.
Typical Use Cases for 02143
- Apartments and condos near Union Square and Central Hill.
- Mail to restaurants, bars, co-working spaces, and studios clustered around Bow St, Somerville Ave, and Washington St.
- Many new developments near the Union Square MBTA Green Line station.
Example address format:
123 Somerville Ave
Somerville, MA 02143
02144 – West Somerville (Davis Square, Teele Square, Ball Square)
ZIP Code: 02144
City (postal): Somerville, MA
Neighborhoods Commonly Associated with 02144
Real estate and neighborhood profiles consistently connect Davis Square, Teele Square, and Ball Square with ZIP 02144.
Key areas include:
- Davis Square – a major commercial and nightlife area centered on the Red Line T stop.
- Teele Square – a smaller square just up Broadway and Holland St, popular with Tufts students and families.
- Ball Square – a largely residential neighborhood at the Broadway/Boston Ave intersection, near Tufts.
- Parts of West Somerville and streets near the Tufts University border.
Typical Use Cases for 02144
- Rentals and condos near Davis Square (Day St, Elm St, College Ave).
- Multifamily homes around Teele Square and on Broadway.
- Student housing close to Tufts University and the new Medford/Tufts Green Line station.
Example address format:
45 Elm St
Somerville, MA 02144
02145 – East & Northeast Somerville (Winter Hill, Ten Hills, Assembly Square)
ZIP Code: 02145
City (postal): Somerville, MA
Neighborhoods Commonly Associated with 02145
Data and local real estate listings connect 02145 to Winter Hill, Ten Hills, and Assembly
Key areas:
- Winter Hill – a dense residential neighborhood on and around Broadway.
- Ten Hills – a smaller neighborhood near the Mystic River and Fellsway, including Ten Hills Rd.
- Assembly Square – a redeveloped waterfront area with a large shopping district, restaurants, and the Orange Line’s Assembly station.
Typical Use Cases for 02145
- Waterfront apartments and condos near Assembly Row shopping and entertainment.
- Single- and multi-family homes in Winter Hill and Ten Hills.
- Mail to big-box retail and office spaces along Mystic Ave and Route 28.
Example address format:
400 Mystic Ave
Somerville, MA 02145
Overlapping & Border Postal Codes (02138, 02140, 02155)
When you zoom out from strictly USPS “Somerville, MA” city labels, some datasets show six ZIP codes touching Somerville’s city boundary: 02138, 02140, 02143, 02144, 02145, and 02155.
These overlapping codes usually use Cambridge or Medford as the primary USPS city name, not Somerville:
| ZIP Code | Primary Postal City | Where It Overlaps Somerville |
|---|---|---|
| 02138 | Cambridge, MA | West of Porter/Inman Sq; touches Somerville border |
| 02140 | Cambridge, MA | North Cambridge, near Alewife Brook Pkwy & Davis Sq area |
| 02155 | Medford, MA | North of Ten Hills/Tufts area; edges Somerville’s northern border |
For mailing, always use the city name shown on the USPS lookup — even if the physical neighborhood feels more like Somerville.
Somerville MA Postal Code Cheat Sheet by Neighborhood
Here’s a simple Somerville MA postal code reference you can skim quickly:
| Neighborhood / Square | Typical ZIP Code(s) | Notes |
|---|---|---|
| Union Square | 02143 | Core commercial & dining hub, Green Line stop. |
| Spring Hill | 02143, 02144 | Hilly residential area between Highland Ave & Somerville Ave. |
| Prospect Hill | 02143 | Historic hill with monument and views. |
| Davis Square | 02144 | Major Red Line hub, shops, nightlife. |
| Teele Square | 02144 | Smaller square up Broadway near Tufts. |
| Ball Square | 02144 | Near Tufts, on Broadway/Boston Ave. |
| Winter Hill | 02145 | East-central residential area, Broadway spine. |
| Ten Hills | 02145 | Mystic River–adjacent neighborhood, Ten Hills Rd. |
| Assembly Square | 02145 | Waterfront shopping/entertainment district. |
How to Look Up the Correct Somerville Postal Code
If you’re ever unsure which Somerville MA postal code to use:
- Use the USPS ZIP Code Lookup
- Enter the full street address and it returns the official ZIP + ZIP+4 and USPS city name.
- Use map-based ZIP tools
- Sites like zipdatamaps.com and UnitedStatesZipCodes.org offer interactive ZIP maps for Somerville.
- Check your lease, utility bill, or local tax bill
- These almost always show the officially recognized mailing ZIP.
- When in doubt, trust USPS over real estate listings
- Real estate sites sometimes stretch neighborhood names across ZIP lines for marketing reasons.
Common Questions About Somerville MA Postal Codes
1. How many Somerville MA postal codes are there?
- USPS lists three primary Somerville ZIP codes: 02143, 02144, 02145.
- Some datasets show six ZIPs touching the city boundary once you include Cambridge/Medford ZIPs that overlap city lines.
2. Which ZIP is Davis Square?
Most of Davis Square addresses use 02144 with city name Somerville, MA.
3. Which ZIP is Union Square?
Union Square is primarily within 02143.
4. What ZIP is Assembly Row in?
Assembly Square / Assembly Row uses 02145.
5. I’m near Teele Square/Tufts. Is my ZIP 02144 or 02140?
- Many Teele Square addresses use 02144, Somerville, MA.
- A few bordering blocks may use 02140, Cambridge, MA, especially on the Cambridge side of Alewife Brook Pkwy.
Always confirm with USPS lookup if you’re on or near the city line.
Conclusion: Mapping Every Somerville MA Postal Code to Real Neighborhoods
Somerville might be geographically small, but its mix of squares, hills, and riverfront neighborhoods makes postal coding surprisingly nuanced. The core takeaway is simple:
- Use 02143 for Union Square, Prospect Hill, Spring Hill, Central Hill.
- Use 02144 for Davis Square, Teele Square, Ball Square, West Somerville.
- Use 02145 for Winter Hill, Ten Hills, Assembly Square, Mystic River area.
Whenever you’re uncertain, cross-check the exact address using USPS lookup or a reputable ZIP map. That way, every time you type or publish a somerville ma postal code, it’s accurate, locally relevant, and ready for both the post office and search engines.