What city is 06831 in?

06831 is a Greenwich, CT mailing address. By land area, 5% lies inside Stamford, 3% lies inside Rock Ridge, 3% lies inside Glenville and 2% lies inside Pemberwick; the rest is outside any Census-defined city or community.

What is the population of 06831?

About 15,210 people (±1,053), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 15,254.

What is the median household income in 06831?

$227,159 (±$25,492), compared with $95,781 for Connecticut as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 06831?

16 USPS carrier routes with 5,843 residential and 261 business mailboxes (6,098 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06831?

The closest, measured center to center: 10504 (3.7 mi, Armonk), 06830 (4 mi, Greenwich), 06807 (4.1 mi, Cos Cob), 10577 (4.4 mi, Harrison), 10604 (4.7 mi, Harrison) and 10573 (5.1 mi, Rye Brook).

06831 ZIP Code, Greenwich, CT

06831 is a ZIP code in Greenwich, Connecticut in Fairfield County. It covers 28 square miles of land. The closest ZIP codes are 10504, 06830 and 06807. 15,210 people live here in 5,382 households. With about 552 people per square mile it is lightly settled, and most homes are owner-occupied (79%). Median household income is $227,159, well above the Connecticut median of $95,781; the median age is 47.5, older than most ZIP codes.

Quick facts

Mailing city: Greenwich, CT
County: Fairfield County
Land area: 28 sq mi
Population: 15,210
Median household income: $227,159
Carrier routes: 16 (5,843 homes)

Key figures

Measure	Value
Residents	15,210
Households	5,382
Median household income	$227,159
Income per person	$142,594
Median age	47.5
Homeowners	79.0%
Median home value	$1,696,000
Median rent	$3,501
Bachelor's degree or higher	70.9%
Average commute (minutes)	29
Households with kids under 18	31.3%
Moved in the past year	9.8%
Below the poverty line	4.6%
Broadband internet	98.8%
Speak a non-English language at home	17.1%

Household income

% of households	Value
<$10K	2.6%
$10–15K	1.2%
$15–25K	3.5%
$25–35K	2.2%
$35–50K	3.0%
$50–75K	6.4%
$75–100K	4.7%
$100–150K	10.7%
$150–200K	10.0%
$200K+	55.6%

Age

% of all residents	Value
<10	9.6%
10–19	12.1%
20–24	4.8%
25–34	8.5%
35–44	11.3%
45–54	12.1%
55–64	18.2%
65–74	13.2%
75+	10.2%

Tenure

% of housing units	Value
Owned, with mortgage	41.9%
Owned outright	27.8%
Rented	18.2%
Vacant	12.1%

Type of building

% of housing units	Value
Detached house	80.4%
Townhome	7.8%
2–4 units	7.6%
5–19 units	1.4%
20+ units	2.7%
Mobile / other	0.0%

Businesses in 06831

438 business establishments with 4,494 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 82
Health Care and Social Assistance: 60
Finance and Insurance: 47
Other Services (except Public Administration): 38
Administrative and Support and Waste Management and Remediation Services: 34
Construction: 32
Real Estate and Rental and Leasing: 30
Retail Trade: 25

EDDM carrier routes

06831 has 16 USPS carrier routes with 5,843 residential and 261 business mailboxes. Open the EDDM route map.

Carrier routes in 06831

06831 has 16 USPS carrier routes (12 city (C), 4 rural (R)) with 5,843 residential and 261 business mailboxes. Routes range from 222 homes (C030) to 580 homes (C052); the median route has 325 homes. The Census counted 5,382 households in 06831 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	2
250–499	10
500–749	4
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 06831 for…

Most businesses

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

Route C049 — USPS business mailboxes 65, 251 homes
Route C017 — USPS business mailboxes 60, 261 homes
Route C030 — USPS business mailboxes 36, 222 homes
Route R004 — USPS business mailboxes 32, 334 homes
Route C048 — USPS business mailboxes 20, 576 homes

Select these 5 routes on the route map

Every carrier route in 06831

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C017	City	261	60	$200,001+	—	—	—
C019	City	223	0	$200,001+	—	—	—
C024	City	342	2	$200,001+	—	—	—
C026	City	510	1	$154,106	—	—	—
C030	City	222	36	$200,001+	—	—	—
C033	City	308	14	$161,843	—	—	—
C039	City	412	10	$186,755	—	—	—
C044	City	500	1	$180,602	—	—	—
C048	City	576	20	$186,755	—	—	—
C049	City	251	65	$97,248	—	—	—
C052	City	580	3	$92,897	—	—	—
C053	City	410	4	$188,014	—	—	—
R001	Rural	310	6	$200,001+	—	—	—
R003	Rural	289	6	$200,001+	—	—	—
R004	Rural	334	32	$200,001+	—	—	—
R005	Rural	315	1	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06831 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

10504 — Armonk CDP, NY (3.7 mi)
06830 — Greenwich CDP, CT (4 mi)
06807 — Cos Cob CDP, CT (4.1 mi)
10577 — Harrison village, NY (4.4 mi)
10604 — Harrison village, NY (4.7 mi)
10573 — Rye Brook village, NY (5.1 mi)
06878 — Riverside CDP, CT (5.6 mi)
06903 — Stamford city, CT (5.6 mi)

Areas that include 06831

Greenwich, CT ZIP codes — 2 ZIP codes
Pemberwick, CT ZIP codes — 1 ZIP code
Glenville, CT ZIP codes — 1 ZIP code
Rock Ridge, CT ZIP codes — 1 ZIP code
Fairfield County ZIP codes — 46 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06831

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) 06831, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06831 in?: 06831 is a Greenwich, CT mailing address. By land area, 5% lies inside Stamford, 3% lies inside Rock Ridge, 3% lies inside Glenville and 2% lies inside Pemberwick; the rest is outside any Census-defined city or community.
What county is 06831 in?: 06831 is in Fairfield County.
What is the population of 06831?: About 15,210 people (±1,053), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 15,254.
What is the median household income in 06831?: $227,159 (±$25,492), compared with $95,781 for Connecticut as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 06831?: 16 USPS carrier routes with 5,843 residential and 261 business mailboxes (6,098 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06831?: The closest, measured center to center: 10504 (3.7 mi, Armonk), 06830 (4 mi, Greenwich), 06807 (4.1 mi, Cos Cob), 10577 (4.4 mi, Harrison), 10604 (4.7 mi, Harrison) and 10573 (5.1 mi, Rye Brook).

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