What city is 06830 in?

06830 is a Greenwich, CT mailing address. By land area, 32% lies inside Greenwich, 7% lies inside Indian Field, 6% lies inside Byram and 1% lies inside Cos Cob; the rest is outside any Census-defined city or community.

What is the population of 06830?

About 24,880 people (±1,156), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 25,043.

What is the median household income in 06830?

$146,654 (±$19,257), 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 06830?

28 USPS carrier routes with 10,357 residential and 1,540 business mailboxes (11,889 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06830?

The closest, measured center to center: 06807 (2.1 mi, Cos Cob), 06878 (2.2 mi, Riverside), 06870 (2.9 mi, Old Greenwich), 10573 (3.1 mi, Rye Brook), 06831 (4 mi, Stamford) and 06902 (4.4 mi, Stamford).

06830 ZIP Code, Greenwich, CT

06830 is a ZIP code in Greenwich, Connecticut in Fairfield County. It covers 14 square miles of land. The closest ZIP codes are 06807, 06878 and 06870. 24,880 people live here in 9,480 households. At about 1,838 people per square mile it has suburban density, and owners and renters are mixed (57% own). Median household income is $146,654, well above the Connecticut median of $95,781.

Quick facts

Mailing city: Greenwich, CT
County: Fairfield County
Land area: 14 sq mi
Population: 24,880
Median household income: $146,654
Carrier routes: 28 (10,357 homes)

Key figures

Measure	Value
Residents	24,880
Households	9,480
Median household income	$146,654
Income per person	$137,502
Median age	43.6
Homeowners	57.4%
Median home value	$1,660,700
Median rent	$2,374
Bachelor's degree or higher	67.9%
Average commute (minutes)	27.8
Households with kids under 18	31.9%
Moved in the past year	12.9%
Below the poverty line	8.6%
Broadband internet	93.6%
Speak a non-English language at home	28.4%

Household income

% of households	Value
<$10K	3.2%
$10–15K	1.8%
$15–25K	5.6%
$25–35K	4.2%
$35–50K	7.0%
$50–75K	9.1%
$75–100K	6.8%
$100–150K	12.6%
$150–200K	8.1%
$200K+	41.5%

Age

% of all residents	Value
<10	11.7%
10–19	14.7%
20–24	5.3%
25–34	8.7%
35–44	11.2%
45–54	13.7%
55–64	14.9%
65–74	11.0%
75+	8.9%

Tenure

% of housing units	Value
Owned, with mortgage	29.1%
Owned outright	21.0%
Rented	36.9%
Vacant	13.0%

Type of building

% of housing units	Value
Detached house	44.5%
Townhome	8.9%
2–4 units	21.6%
5–19 units	12.1%
20+ units	12.9%
Mobile / other	0.1%

Businesses in 06830

1,519 business establishments with 30,585 employees (ZIP Codes Business Patterns 2023).

Finance and Insurance: 269
Retail Trade: 210
Professional, Scientific, and Technical Services: 179
Other Services (except Public Administration): 161
Health Care and Social Assistance: 151
Accommodation and Food Services: 109
Real Estate and Rental and Leasing: 91
Construction: 78

EDDM carrier routes

06830 has 28 USPS carrier routes with 10,357 residential and 1,540 business mailboxes. Open the EDDM route map.

Carrier routes in 06830

06830 has 28 USPS carrier routes (28 city (C)) with 10,357 residential and 1,540 business mailboxes. Routes range from 215 homes (C051) to 575 homes (C043); the median route has 330 homes. The Census counted 9,480 households in 06830 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	4
250–499	18
500–749	6
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 06830 for…

Most businesses

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

Route C051 — USPS business mailboxes 279, 215 homes
Route C016 — USPS business mailboxes 180, 332 homes
Route C065 — USPS business mailboxes 180, 308 homes
Route C020 — USPS business mailboxes 142, 217 homes
Route C064 — USPS business mailboxes 128, 259 homes

Select these 5 routes on the route map

Every carrier route in 06830

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	537	59	$94,301	—	—	—
C003	City	284	2	$200,001+	—	—	—
C004	City	528	47	$200,001+	—	—	—
C005	City	364	10	$200,001+	—	—	—
C006	City	466	82	$111,539	—	—	—
C007	City	570	5	$104,120	—	—	—
C009	City	475	1	$92,842	—	—	—
C015	City	242	112	$94,301	—	—	—
C016	City	332	180	$94,301	—	—	—
C020	City	217	142	$200,001+	—	—	—
C021	City	253	5	$200,001+	—	—	—
C023	City	273	2	$200,001+	—	—	—
C025	City	263	0	$200,001+	—	—	—
C027	City	379	3	$200,001+	—	—	—
C031	City	460	33	$69,062	—	—	—
C032	City	298	5	$200,001+	—	—	—
C035	City	279	38	$200,001+	—	—	—
C041	City	350	13	$150,493	—	—	—
C042	City	543	8	$97,248	—	—	—
C043	City	575	93	$150,493	—	—	—
C045	City	498	37	$97,248	—	—	—
C047	City	230	22	$200,001+	—	—	—
C050	City	289	29	$200,001+	—	—	—
C051	City	215	279	$132,157	—	—	—
C059	City	543	14	$179,452	—	—	—
C060	City	327	11	$200,001+	—	—	—
C064	City	259	128	$200,001+	—	—	—
C065	City	308	180	$179,452	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06830 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

06807 — Cos Cob CDP, CT (2.1 mi)
06878 — Riverside CDP, CT (2.2 mi)
06870 — Old Greenwich CDP, CT (2.9 mi)
10573 — Rye Brook village, NY (3.1 mi)
06831 — Stamford city, CT (4 mi)
06902 — Stamford city, CT (4.4 mi)
10577 — Harrison village, NY (4.5 mi)
06901 — Stamford city, CT (4.6 mi)

Areas that include 06830

Greenwich, CT ZIP codes — 2 ZIP codes
Byram, CT ZIP codes — 1 ZIP code
Indian Field, CT ZIP codes — 1 ZIP code
Fairfield County ZIP codes — 46 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06830

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) 06830, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06830 in?: 06830 is a Greenwich, CT mailing address. By land area, 32% lies inside Greenwich, 7% lies inside Indian Field, 6% lies inside Byram and 1% lies inside Cos Cob; the rest is outside any Census-defined city or community.
What county is 06830 in?: 06830 is in Fairfield County.
What is the population of 06830?: About 24,880 people (±1,156), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 25,043.
What is the median household income in 06830?: $146,654 (±$19,257), 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 06830?: 28 USPS carrier routes with 10,357 residential and 1,540 business mailboxes (11,889 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06830?: The closest, measured center to center: 06807 (2.1 mi, Cos Cob), 06878 (2.2 mi, Riverside), 06870 (2.9 mi, Old Greenwich), 10573 (3.1 mi, Rye Brook), 06831 (4 mi, Stamford) and 06902 (4.4 mi, Stamford).

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