Residential delivery area · Connecticut
ZIP Code 06831: Greenwich, CT
ZIP code 06831 uses the postal name Greenwich, Connecticut and lies entirely in Fairfield County (Census 2020 ZIP-county file). About 15,000 people live there (Census Bureau, ACS 2020-2024), the less populous of Greenwich's 2 residential ZIP codes. Median household income is $227,159 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Rock Ridge (3%), Glenville (3%) and Pemberwick (3%), and 7% in smaller places; 85% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Greenwich · 2 residential ZIPs
- County
- Fairfield County
- Census places
- Rock Ridge (3%) census-designated place; Glenville (3%) census-designated place; Pemberwick (3%) census-designated place
- House district
- CT-4 119th Congress
- State
- Connecticut
- Time zone
- Eastern
- Land area
- 27.6 sq mi · 552 people per sq mi
- PO Box ZIPs
- 06836 also use the name Greenwich
Where is ZIP code 06831?
06831 centers on 41.089°, -73.659° and covers 27.6 square miles of land plus 0.5 of water. It borders 6 ZIP codes: 10504, 06830, 10604, 10573, 06903, 10506.
The map draws ZIP code areas only. For the streets inside 06831, 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 06831 compare with the rest of Greenwich?
| Measure | 06831 | In Greenwich | In Fairfield County | In CT |
|---|---|---|---|---|
| People (ACS 2020-2024) | 15,210 | 2nd of 2 | 28th of 46 | 93rd of 288 |
| Median household income | $227k | 1st of 2 | 9th of 45 | 9th of 228 |
| Median home value | $1.7M | 1st of 2 | 4th of 46 | 4th of 245 |
Its median household income is higher than in 99% of U.S. residential ZIP codes, and it is denser than 73% 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 06831?
The 2020 Census counted 15,254 people in 06831; the ACS, which samples households over 2020-2024, estimates 15,210. Between the 2010 and 2020 censuses its population grew 3.1% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 15,210
- 2020 Census count
- 15,254+3.1% since 2010 (14,792)
- Households
- 5,382
- Median age
- 47.5
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 06831?
Of the 15,210 people the ACS estimates in 06831, 21.3% are under 18 and 23.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (79.8%), then Hispanic or Latino (11.3%).
- Under 1821.3%
- 18 to 6455.4%
- 65 and older23.3%
- White, not Hispanic79.8%
- Hispanic or Latino11.3%
- Other or two or more4.3%
- Asian, not Hispanic3.8%
- Black, not Hispanic0.8%
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 06831 earn?
Median household income is $227,159 (ACS 2020-2024), the 9th highest of the 45 ranked ZIP codes in Fairfield County. It is not measurably different from 2015-2019 ($205,009 in 2024 dollars): the change is within the surveys' margins of error.
By IRS adjusted gross income per tax return ($794,111, 2022), 06831 ranks 24th 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
- $227,159±$25,492
- Income per person
- $142,594
- Below the poverty line
- 4.6%
- Unemployed (of the labor force)
- 4.2%
- Adults 25+ with a bachelor's degree
- 70.9%
- Adjusted gross income per tax return, 2022
- $794,1117,270 returns; wages 42% 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 06831?
FHFA's house price index for 06831, built from repeat sales and appraisals of the same homes, rose 58% from 2015 to 2025 and rose 52% from 2020 to 2025, and moved +7.1% in 2025.
- Median home value (owners' estimate)
- $1,696,000
- Median gross rent
- $3,500 or more
- Homes owned by their occupants
- 79.0%
- Housing units
- 6,135
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 06831?
438 business establishments had a location in this ZIP code in 2023, 19 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services82
- Health care and social assistance60
- Finance and insurance47
- Other services (except public administration)38
- Administrative and support and waste management and remediation services34
- Construction32
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 06831?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 10504 | Armonk, NY | 7,665 | $250k+ | 3.7 mi |
| 06830 | Greenwich | 24,880 | $147k | 4.0 mi |
| 10604 | West Harrison, NY | 12,517 | $117k | 4.7 mi |
| 10573 | Port Chester, NY | 40,786 | $106k | 5.1 mi |
| 06903 | Stamford | 14,010 | $204k | 5.6 mi |
| 10506 | Bedford, NY | 6,244 | $250k+ | 7.1 mi |
| 06807 | Cos Cob | 7,650 | $192k | 4.1 mi (near) |
| 10577 | Purchase, NY | 5,945 | $250k+ | 4.4 mi (near) |
| 06878 | Riverside | 8,328 | $250k+ | 5.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.