03431 ZIP Code, Keene, NH

03431 is a ZIP code in Keene, New Hampshire in Cheshire County. It covers 60 square miles of land. The closest ZIP codes are 03448, 03445 and 03467. 25,065 people live here in 10,228 households, more than in 9 of every 10 New Hampshire ZIP codes. With about 418 people per square mile it is lightly settled, and owners and renters are mixed (56% own). Median household income is $79,541, below the New Hampshire median of $99,031.

Quick facts

Key figures

MeasureValue
Residents25,065
Households10,228
Median household income$79,541
Income per person$41,070
Median age38.4
Homeowners56.2%
Median home value$255,500
Median rent$1,343
Bachelor's degree or higher41.9%
Average commute (minutes)17.7
Households with kids under 1819.5%
Moved in the past year15.3%
Below the poverty line9.8%
Broadband internet91.5%
Speak a non-English language at home5.5%

Household income

% of householdsValue
<$10K3.4%
$10–15K3.3%
$15–25K6.5%
$25–35K6.1%
$35–50K11.0%
$50–75K17.5%
$75–100K16.6%
$100–150K20.0%
$150–200K8.8%
$200K+6.9%

Age

% of all residentsValue
<107.9%
10–1911.8%
20–2410.3%
25–3415.6%
35–4411.7%
45–5411.2%
55–6411.9%
65–749.9%
75+9.5%

Tenure

% of housing unitsValue
Owned, with mortgage29.3%
Owned outright21.2%
Rented38.5%
Vacant11.0%

Type of building

% of housing unitsValue
Detached house49.5%
Townhome3.5%
2–4 units19.1%
5–19 units12.1%
20+ units11.9%
Mobile / other3.9%

Businesses in 03431

841 business establishments with 16,004 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

03431 has 21 USPS carrier routes with 11,178 residential and 985 business mailboxes. Open the EDDM route map.

Carrier routes in 03431

03431 has 21 USPS carrier routes (16 city (C), 4 rural (R), 1 highway contract (H)) with 11,178 residential and 985 business mailboxes. Routes range from 223 homes (H032) to 791 homes (C007); the median route has 526 homes. The Census counted 10,228 households in 03431 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2491
250–4997
500–74911
750–9992
1,000–1,4990
1,500+0

Best routes in 03431 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C001 — USPS business mailboxes 202, 659 homes
  2. Route C005 — USPS business mailboxes 121, 633 homes
  3. Route C016 — USPS business mailboxes 100, 401 homes
  4. Route C017 — USPS business mailboxes 98, 603 homes
  5. Route C007 — USPS business mailboxes 81, 791 homes

Select these 5 routes on the route map

Every carrier route in 03431

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City659202$58,501———
C002City51338$57,208———
C003City66357$49,670———
C005City633121$58,501———
C006City57717$65,085———
C007City79181$131,011———
C009City4623$58,501———
C010City5523$73,865———
C011City5260$101,632———
C012City50541$77,219———
C013City5617$100,595———
C015City4695$100,595———
C016City401100$100,595———
C017City60398$34,229———
C018City54869$66,400———
C020City48143$100,595———
H032Highway contract2235$47,489———
R001Rural25641$100,272———
R002Rural4909$100,272———
R003Rural78621$74,474———
R004Rural47924$100,272———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 03431 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

Areas that include 03431

Where it ranks

Mail every home in 03431

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) 03431, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 03431 in?
03431 is a Keene, NH mailing address. By land area, 62% lies inside Keene; the rest is outside any Census-defined city or community.
What county is 03431 in?
03431 is in Cheshire County.
What is the population of 03431?
About 25,065 people (±367), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 24,978.
What is the median household income in 03431?
$79,541 (±$6,355), compared with $99,031 for New Hampshire as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 03431?
21 USPS carrier routes with 11,178 residential and 985 business mailboxes (12,186 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 03431?
The closest, measured center to center: 03448 (5.4 mi), 03445 (5.7 mi), 03467 (6.5 mi), 03462 (6.9 mi), 03446 (7.7 mi, West Swanzey) and 03455 (8 mi, Marlborough).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.