01431 ZIP Code, Ashby, MA
01431 is a ZIP code in Ashby, Massachusetts in Middlesex County. It covers 24 square miles of land. The closest ZIP codes are 01474, 01430 and 03071. 3,211 people live here in 1,261 households. With about 136 people per square mile it is lightly settled, and most homes are owner-occupied (96%). Median household income is $115,598, above the Massachusetts median of $103,960; the median age is 50.5, older than most ZIP codes.
Quick facts
- Mailing city: Ashby, MA
- County: Middlesex County
- Land area: 24 sq mi
- Population: 3,211
- Median household income: $115,598
- Carrier routes: 2 (1,124 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 3,211 |
| Households | 1,261 |
| Median household income | $115,598 |
| Income per person | $57,840 |
| Median age | 50.5 |
| Homeowners | 95.5% |
| Median home value | $390,500 |
| Median rent | $1,200 |
| Bachelor's degree or higher | 43.7% |
| Average commute (minutes) | 32.9 |
| Households with kids under 18 | 22.8% |
| Moved in the past year | 5.2% |
| Below the poverty line | 2.6% |
| Broadband internet | 97.1% |
| Speak a non-English language at home | 4.1% |
Household income
| % of households | Value |
|---|---|
| <$10K | 0.4% |
| $10–15K | 1.5% |
| $15–25K | 3.5% |
| $25–35K | 0.8% |
| $35–50K | 11.1% |
| $50–75K | 10.5% |
| $75–100K | 11.2% |
| $100–150K | 28.1% |
| $150–200K | 13.5% |
| $200K+ | 19.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 6.5% |
| 10–19 | 11.9% |
| 20–24 | 5.1% |
| 25–34 | 6.4% |
| 35–44 | 12.1% |
| 45–54 | 15.0% |
| 55–64 | 21.3% |
| 65–74 | 16.4% |
| 75+ | 5.1% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 65.5% |
| Owned outright | 26.0% |
| Rented | 4.1% |
| Vacant | 4.3% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 95.6% |
| Townhome | 2.2% |
| 2–4 units | 1.3% |
| 5–19 units | 0.0% |
| 20+ units | 0.0% |
| Mobile / other | 1.0% |
Businesses in 01431
60 business establishments with 224 employees (ZIP Codes Business Patterns 2023).
- Construction: 19
- Administrative and Support and Waste Management and Remediation Services: 7
- Other Services (except Public Administration): 7
- Manufacturing: 5
- Professional, Scientific, and Technical Services: 5
- Retail Trade: 4
- Accommodation and Food Services: 3
EDDM carrier routes
01431 has 2 USPS carrier routes with 1,124 residential and 30 business mailboxes. Open the EDDM route map.
Carrier routes in 01431
01431 has 2 USPS carrier routes (2 rural (R)) with 1,124 residential and 30 business mailboxes. Routes range from 561 homes (R002) to 563 homes (R001); the median route has 562 homes. The Census counted 1,261 households in 01431 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 0 |
| 500–749 | 2 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 01431 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R001 — USPS business mailboxes 21, 563 homes
- Route R002 — USPS business mailboxes 9, 561 homes
Select these 2 routes on the route map
Every carrier route in 01431
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R001 | Rural | 563 | 21 | $162,600 | — | — | — |
| R002 | Rural | 561 | 9 | $111,519 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 01431 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
- 01474 (4.3 mi)
- 01430 — South Ashburnham CDP, MA (4.5 mi)
- 03071 (5.3 mi)
- 03048 — Greenville CDP, NH (5.8 mi)
- 01420 — Fitchburg city, MA (6.4 mi)
- 01469 — Townsend CDP, MA (7 mi)
- 01462 — Lunenburg CDP, MA (8.6 mi)
- 01473 (9.2 mi)
Areas that include 01431
- Ashby, MA ZIP codes — 1 ZIP code
- Middlesex County ZIP codes — 83 ZIP codes
- Massachusetts ZIP code data
Where it ranks
- No. 3 of 82: highest share of owner-occupied homes in Middlesex County
- No. 3 of 82: highest median age in Middlesex County
Mail every home in 01431
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) 01431, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 01431 in?
- 01431 is a Ashby, MA mailing address. None of its land lies inside a Census-defined city or community.
- What county is 01431 in?
- 01431 is in Middlesex County.
- What is the population of 01431?
- About 3,211 people (±17), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 3,193.
- What is the median household income in 01431?
- $115,598 (±$9,187), 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 01431?
- 2 USPS carrier routes with 1,124 residential and 30 business mailboxes (1,161 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 01431?
- The closest, measured center to center: 01474 (4.3 mi), 01430 (4.5 mi, South Ashburnham), 03071 (5.3 mi), 03048 (5.8 mi, Greenville), 01420 (6.4 mi, Fitchburg) and 01469 (7 mi, Townsend).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.