02451 ZIP Code, Waltham, MA
02451 is a ZIP code in Waltham, Massachusetts in Middlesex County. It covers 5.3 square miles of land. The closest ZIP codes are 02452, 02453 and 02421. 17,393 people live here in 7,481 households. At about 3,269 people per square mile it has suburban density, and owners and renters are mixed (59% own). Median household income is $122,335, above the Massachusetts median of $103,960.
Quick facts
- Mailing city: Waltham, MA
- County: Middlesex County
- Land area: 5.3 sq mi
- Population: 17,393
- Median household income: $122,335
- Carrier routes: 18 (8,280 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 17,393 |
| Households | 7,481 |
| Median household income | $122,335 |
| Income per person | $67,455 |
| Median age | 40.3 |
| Homeowners | 59.3% |
| Median home value | $753,000 |
| Median rent | $2,677 |
| Bachelor's degree or higher | 56.0% |
| Average commute (minutes) | 26.1 |
| Households with kids under 18 | 18.6% |
| Moved in the past year | 14.5% |
| Below the poverty line | 8.3% |
| Broadband internet | 94.2% |
| Speak a non-English language at home | 32.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 0.9% |
| $10–15K | 2.8% |
| $15–25K | 8.3% |
| $25–35K | 3.5% |
| $35–50K | 8.0% |
| $50–75K | 7.6% |
| $75–100K | 7.8% |
| $100–150K | 19.2% |
| $150–200K | 13.3% |
| $200K+ | 28.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 10.1% |
| 10–19 | 5.8% |
| 20–24 | 8.3% |
| 25–34 | 16.3% |
| 35–44 | 14.5% |
| 45–54 | 11.9% |
| 55–64 | 14.3% |
| 65–74 | 9.1% |
| 75+ | 9.7% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 38.3% |
| Owned outright | 19.2% |
| Rented | 39.0% |
| Vacant | 3.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 55.0% |
| Townhome | 7.2% |
| 2–4 units | 17.4% |
| 5–19 units | 12.1% |
| 20+ units | 8.0% |
| Mobile / other | 0.3% |
Businesses in 02451
1,195 business establishments with 59,760 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 226
- Accommodation and Food Services: 169
- Health Care and Social Assistance: 133
- Administrative and Support and Waste Management and Remediation Services: 97
- Finance and Insurance: 85
- Construction: 75
- Information: 67
- Other Services (except Public Administration): 65
EDDM carrier routes
02451 has 18 USPS carrier routes with 8,280 residential and 1,115 business mailboxes. Open the EDDM route map.
Carrier routes in 02451
02451 has 18 USPS carrier routes (18 city (C)) with 8,280 residential and 1,115 business mailboxes. Routes range from 27 homes (C072) to 847 homes (C008); the median route has 515 homes. The Census counted 7,481 households in 02451 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 3 |
| 250–499 | 6 |
| 500–749 | 8 |
| 750–999 | 1 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 02451 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C097 — USPS business mailboxes 275, 34 homes
- Route C072 — USPS business mailboxes 153, 27 homes
- Route C087 — USPS business mailboxes 136, 328 homes
- Route C056 — USPS business mailboxes 130, 231 homes
- Route C050 — USPS business mailboxes 121, 591 homes
Select these 5 routes on the route map
Every carrier route in 02451
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C008 | City | 847 | 48 | $75,146 | — | — | — |
| C014 | City | 399 | 1 | $157,494 | — | — | — |
| C016 | City | 435 | 1 | $105,000 | — | — | — |
| C017 | City | 604 | 15 | $105,000 | — | — | — |
| C023 | City | 532 | 6 | $140,076 | — | — | — |
| C032 | City | 319 | 25 | $200,001+ | — | — | — |
| C035 | City | 492 | 2 | $175,764 | — | — | — |
| C039 | City | 618 | 12 | $200,001+ | — | — | — |
| C041 | City | 497 | 109 | $97,372 | — | — | — |
| C042 | City | 586 | 63 | $140,076 | — | — | — |
| C050 | City | 591 | 121 | $84,455 | — | — | — |
| C056 | City | 231 | 130 | $200,001+ | — | — | — |
| C059 | City | 591 | 2 | $113,698 | — | — | — |
| C072 | City | 27 | 153 | $172,389 | — | — | — |
| C073 | City | 546 | 15 | $200,001+ | — | — | — |
| C078 | City | 603 | 1 | $140,076 | — | — | — |
| C087 | City | 328 | 136 | $172,389 | — | — | — |
| C097 | City | 34 | 275 | $86,776 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 02451 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 02452 — Waltham city, MA (1.7 mi)
- 02453 — Waltham city, MA (2.3 mi)
- 02421 — Lexington CDP, MA (2.6 mi)
- 01773 — Waltham city, MA (3.4 mi)
- 02478 — Belmont CDP, MA (3.7 mi)
- 02465 — Newton city, MA (3.8 mi)
- 02493 (3.8 mi)
- 02466 — Newton city, MA (3.9 mi)
Areas that include 02451
- Waltham, MA ZIP codes — 3 ZIP codes
- Middlesex County ZIP codes — 83 ZIP codes
- Massachusetts ZIP code data
Where it ranks
Mail every home in 02451
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 02451, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 02451 in?
- 02451 is a Waltham, MA mailing address. By land area, 100% lies inside Waltham.
- What county is 02451 in?
- 02451 is in Middlesex County.
- What is the population of 02451?
- About 17,393 people (±1,277), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 17,953.
- What is the median household income in 02451?
- $122,335 (±$10,961), compared with $103,960 for Massachusetts as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 02451?
- 18 USPS carrier routes with 8,280 residential and 1,115 business mailboxes (9,403 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 02451?
- The closest, measured center to center: 02452 (1.7 mi, Waltham), 02453 (2.3 mi, Waltham), 02421 (2.6 mi, Lexington), 01773 (3.4 mi, Waltham), 02478 (3.7 mi, Belmont) and 02465 (3.8 mi, Newton).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.