Residential delivery area · Connecticut
ZIP Code 06840: New Canaan, CT
ZIP code 06840 uses the postal name New Canaan, Connecticut and lies entirely in Fairfield County (Census 2020 ZIP-county file). About 21,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $250,000 or more (Census Bureau, ACS 2020-2024). By Census place, 7% of its land lies in New Canaan (a census-designated place); 93% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- New Canaan · its only residential ZIP
- County
- Fairfield County
- Census places
- New Canaan census-designated place
- House district
- CT-4 119th Congress
- State
- Connecticut
- Time zone
- Eastern
- Land area
- 22.2 sq mi · 941 people per sq mi
Where is ZIP code 06840?
06840 centers on 41.160°, -73.500° and covers 22.2 square miles of land plus 0.3 of water. It borders 7 ZIP codes: 06850, 06903, 06907, 06897, 10576, 06820, 10590.
The map draws ZIP code areas only. For the streets inside 06840, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 06840 compare with the rest of Fairfield County?
| Measure | 06840 | In Fairfield County | In CT |
|---|---|---|---|
| People (ACS 2020-2024) | 20,870 | 19th of 46 | 62nd of 288 |
| Median household income | $250k+ | 1= of 45 | 1= of 228 |
| Median home value | $1.61M | 6th of 46 | 6th of 245 |
1= means a shared first place: 06840's median household income ties with 6 other ZIP codes at the Census cap in Fairfield County; median household income ties with 6 other ZIP codes at the Census cap in Connecticut.
Its median household income is at the Census cap of $250,000 or more, like 117 other U.S. residential ZIP codes (69 of the 118 are large enough to rank), and it is denser than 78% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 06840?
The 2020 Census counted 20,612 people in 06840; the ACS, which samples households over 2020-2024, estimates 20,870. Between the 2010 and 2020 censuses its population grew 4.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 20,870
- 2020 Census count
- 20,612+4.4% since 2010 (19,738)
- Households
- 7,153
- Median age
- 42.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 06840?
Of the 20,870 people the ACS estimates in 06840, 26.6% are under 18 and 15.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (80.9%).
- Under 1826.6%
- 18 to 6458.0%
- 65 and older15.5%
- White, not Hispanic80.9%
- Hispanic or Latino6.3%
- Other or two or more5.7%
- Asian, not Hispanic5.4%
- Black, not Hispanic1.7%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 06840 earn?
Median household income is $250,000 or more (ACS 2020-2024), the highest of the 45 ranked ZIP codes in Fairfield County.
By IRS adjusted gross income per tax return ($695,618, 2022), 06840 ranks 40th in the U.S. among ZIP codes of 1,000+ people with 200+ returns and at most 1.5 returns per household (see the ranking).
- Median household income
- $250,000 or more
- Income per person
- $143,695
- Below the poverty line
- 3.7%
- Unemployed (of the labor force)
- 5.2%
- Adults 25+ with a bachelor's degree
- 82.5%
- Adjusted gross income per tax return, 2022
- $695,6189,110 returns; wages 50% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 06840?
FHFA's house price index for 06840, built from repeat sales and appraisals of the same homes, rose 29% from 2015 to 2025 and rose 39% from 2020 to 2025, and moved +4.3% in 2025.
- Median home value (owners' estimate)
- $1,611,900
- Median gross rent
- $3,401
- Homes owned by their occupants
- 83.7%
- Housing units
- 7,747
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 06840?
665 business establishments had a location in this ZIP code in 2023, 43 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services111
- Retail trade72
- Finance and insurance67
- Accommodation and food services67
- Health care and social assistance66
- Other services (except public administration)65
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 06840?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 06850 | Norwalk | 19,692 | $124k | 3.7 mi |
| 06903 | Stamford | 14,010 | $204k | 4.1 mi |
| 06907 | Stamford | 8,705 | $106k | 4.2 mi |
| 06897 | Wilton | 18,777 | $242k | 4.7 mi |
| 10576 | Pound Ridge, NY | 4,891 | $250k+ | 5.7 mi |
| 06820 | Darien | 21,936 | $250k+ | 5.9 mi |
| 10590 | South Salem, NY | 6,989 | $212k | 6.9 mi |
| 06851 | Norwalk | 27,865 | $111k | 5.4 mi (near) |
| 06905 | Stamford | 20,725 | $137k | 5.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.