What city is 06851 in?

06851 is a Norwalk, CT mailing address. By land area, 100% lies inside Norwalk.

What is the population of 06851?

About 27,865 people (±1,499), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 28,254.

What is the median household income in 06851?

$111,341 (±$6,736), 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 06851?

26 USPS carrier routes with 11,658 residential and 986 business mailboxes (12,839 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 06851?

The closest, measured center to center: 06850 (2.4 mi, Norwalk), 06880 (3 mi, Staples), 06854 (3.6 mi, Norwalk), 06855 (4.6 mi, Norwalk), 06853 (5.3 mi, Norwalk) and 06840 (5.4 mi, New Canaan).

06851 ZIP Code, Norwalk, CT

06851 is a ZIP code in Norwalk, Connecticut in Fairfield County. It covers 7.7 square miles of land. The closest ZIP codes are 06850, 06880 and 06854. 27,865 people live here in 11,348 households. At about 3,625 people per square mile it has suburban density, and owners and renters are mixed (62% own). Median household income is $111,341, above the Connecticut median of $95,781.

Quick facts

Mailing city: Norwalk, CT
County: Fairfield County
Land area: 7.7 sq mi
Population: 27,865
Median household income: $111,341
Carrier routes: 26 (11,658 homes)

Key figures

Measure	Value
Residents	27,865
Households	11,348
Median household income	$111,341
Income per person	$64,597
Median age	43.2
Homeowners	61.6%
Median home value	$587,400
Median rent	$2,071
Bachelor's degree or higher	46.4%
Average commute (minutes)	28.4
Households with kids under 18	24.3%
Moved in the past year	7.3%
Below the poverty line	8.1%
Broadband internet	91.9%
Speak a non-English language at home	36.6%

Household income

% of households	Value
<$10K	1.6%
$10–15K	3.8%
$15–25K	4.2%
$25–35K	4.4%
$35–50K	8.6%
$50–75K	9.8%
$75–100K	12.8%
$100–150K	17.3%
$150–200K	10.7%
$200K+	26.6%

Age

% of all residents	Value
<10	8.5%
10–19	9.7%
20–24	4.5%
25–34	14.7%
35–44	14.5%
45–54	13.4%
55–64	15.1%
65–74	11.0%
75+	8.5%

Tenure

% of housing units	Value
Owned, with mortgage	43.0%
Owned outright	16.5%
Rented	35.8%
Vacant	4.6%

Type of building

% of housing units	Value
Detached house	52.8%
Townhome	7.3%
2–4 units	13.7%
5–19 units	10.6%
20+ units	15.2%
Mobile / other	0.4%

Businesses in 06851

1,061 business establishments with 17,184 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 180
Retail Trade: 128
Other Services (except Public Administration): 116
Accommodation and Food Services: 107
Professional, Scientific, and Technical Services: 106
Construction: 84
Administrative and Support and Waste Management and Remediation Services: 78
Finance and Insurance: 57

EDDM carrier routes

06851 has 26 USPS carrier routes with 11,658 residential and 986 business mailboxes. Open the EDDM route map.

Carrier routes in 06851

06851 has 26 USPS carrier routes (22 city (C), 4 rural (R)) with 11,658 residential and 986 business mailboxes. Routes range from 264 homes (C005) to 640 homes (C015); the median route has 460 homes. The Census counted 11,348 households in 06851 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	18
500–749	8
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 06851 for…

Most businesses

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

Route C007 — USPS business mailboxes 147, 294 homes
Route C005 — USPS business mailboxes 133, 264 homes
Route C020 — USPS business mailboxes 131, 569 homes
Route C047 — USPS business mailboxes 112, 307 homes
Route C014 — USPS business mailboxes 95, 454 homes

Select these 5 routes on the route map

Every carrier route in 06851

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	353	1	$104,670	—	—	—
C003	City	603	0	$94,334	—	—	—
C005	City	264	133	$99,213	—	—	—
C006	City	419	79	$70,268	—	—	—
C007	City	294	147	$84,142	—	—	—
C010	City	413	0	$85,120	—	—	—
C011	City	398	3	$110,527	—	—	—
C012	City	419	7	$99,213	—	—	—
C014	City	454	95	$94,334	—	—	—
C015	City	640	29	$70,268	—	—	—
C018	City	589	39	$70,268	—	—	—
C020	City	569	131	$72,352	—	—	—
C021	City	528	13	$72,352	—	—	—
C024	City	465	1	$136,646	—	—	—
C025	City	360	1	$104,670	—	—	—
C026	City	568	0	$114,632	—	—	—
C031	City	361	66	$85,120	—	—	—
C034	City	368	83	$88,444	—	—	—
C035	City	513	17	$136,646	—	—	—
C036	City	477	7	$161,917	—	—	—
C038	City	338	1	$194,428	—	—	—
C047	City	307	112	$82,942	—	—	—
R001	Rural	470	4	$99,480	—	—	—
R002	Rural	484	4	$161,917	—	—	—
R003	Rural	482	7	$152,247	—	—	—
R004	Rural	522	6	$99,480	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 06851 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

06850 — Norwalk city, CT (2.4 mi)
06880 — Staples CDP, CT (3 mi)
06854 — Norwalk city, CT (3.6 mi)
06855 — Norwalk city, CT (4.6 mi)
06853 — Norwalk city, CT (5.3 mi)
06840 — New Canaan CDP, CT (5.4 mi)
06897 — Georgetown CDP, CT (5.4 mi)
06820 — Tokeneke CDP, CT (5.9 mi)

Areas that include 06851

Norwalk, CT ZIP codes — 5 ZIP codes
Fairfield County ZIP codes — 46 ZIP codes
Connecticut ZIP code data

Where it ranks

Mail every home in 06851

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) 06851, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 06851 in?: 06851 is a Norwalk, CT mailing address. By land area, 100% lies inside Norwalk.
What county is 06851 in?: 06851 is in Fairfield County.
What is the population of 06851?: About 27,865 people (±1,499), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 28,254.
What is the median household income in 06851?: $111,341 (±$6,736), 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 06851?: 26 USPS carrier routes with 11,658 residential and 986 business mailboxes (12,839 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 06851?: The closest, measured center to center: 06850 (2.4 mi, Norwalk), 06880 (3 mi, Staples), 06854 (3.6 mi, Norwalk), 06855 (4.6 mi, Norwalk), 06853 (5.3 mi, Norwalk) and 06840 (5.4 mi, New Canaan).

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