Residential delivery area · New York
ZIP Code 12123: Nassau, NY
ZIP code 12123 uses the postal name Nassau, New York and lies mostly in Rensselaer County (98% of its land) with the rest in Columbia County (Census 2020 ZIP-county file). About 4,500 people live there (Census Bureau, ACS 2020-2024). Median household income is $108,878 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Nassau Lake (5%) and Nassau (2%), and 2% in smaller places; 91% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Nassau · its only residential ZIP
- County
- Rensselaer County (98%); Columbia County (2%)
- Census places
- Nassau Lake (5%) census-designated place; Nassau (2%)
- Metro area
- Albany-Schenectady-Troy, NY
- House district
- NY-19 119th Congress
- State
- New York
- Time zone
- Eastern
- Land area
- 31.8 sq mi · 140 people per sq mi
Where is ZIP code 12123?
12123 centers on 42.522°, -73.606° and covers 31.8 square miles of land plus 0.5 of water. It borders 9 ZIP codes: 12063, 12115, 12132, 12024, 12033, 12062, 12061, 12184, 12018.
The map draws ZIP code areas only. For the streets inside 12123, 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 12123 compare with the rest of Rensselaer County?
| Measure | 12123 | In Rensselaer County | In NY |
|---|---|---|---|
| People (ACS 2020-2024) | 4,457 | 11th of 30 | 765th of 1,826 |
| Median household income | $109k | 6th of 19 | 300th of 1,081 |
| Median home value | $297k | 8th of 23 | 567th of 1,172 |
Its median household income is higher than in 86% of U.S. residential ZIP codes, and it is denser than 58% 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 12123?
The 2020 Census counted 5,096 people in 12123; the ACS, which samples households over 2020-2024, estimates 4,457. Between the 2010 and 2020 censuses its population fell 0.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 4,457±610 (90% margin)
- 2020 Census count
- 5,096−0.5% since 2010 (5,124)
- Households
- 1,964
- Median age
- 43.4
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 12123?
Of the 4,457 people the ACS estimates in 12123, 20.1% are under 18 and 20.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (86.9%).
- Under 1820.1%
- 18 to 6459.1%
- 65 and older20.8%
- White, not Hispanic86.9%
- Other or two or more6.9%
- Hispanic or Latino4.4%
- Black, not Hispanic1.0%
- Asian, not Hispanic0.7%
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 12123 earn?
Median household income is $108,878 (ACS 2020-2024), the 6th highest of the 19 ranked ZIP codes in Rensselaer County. It is not measurably different from 2015-2019 ($114,044 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $108,878±$15,610
- Income per person
- $59,099
- Below the poverty line
- 9.0%
- Unemployed (of the labor force)
- 2.2%
- Adults 25+ with a bachelor's degree
- 36.9%
- Adjusted gross income per tax return, 2022
- $82,6212,630 returns; wages 71% 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 12123?
FHFA's house price index for 12123, built from repeat sales and appraisals of the same homes, rose 73% from 2015 to 2025 and rose 52% from 2020 to 2025, and moved +16.5% in 2025.
- Median home value (owners' estimate)
- $297,000
- Median gross rent
- $1,023
- Homes owned by their occupants
- 82.5%
- Housing units
- 2,203
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 12123?
83 business establishments had a location in this ZIP code in 2023, 7 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction17
- Other services (except public administration)14
- Retail trade11
- Administrative and support and waste management and remediation services11
- Professional, scientific, and technical services6
- Accommodation and food services5
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 12123?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 12063 | East Schodack | 665 | $91k | 3.5 mi |
| 12115 | Malden Bridge | 60 | $92k | 3.8 mi |
| 12132 | North Chatham | 111 | – | 3.8 mi |
| 12024 | Brainard | 78 | – | 4.6 mi |
| 12033 | Castleton On Hudson | 7,932 | $99k | 4.8 mi |
| 12062 | East Nassau | 1,650 | $88k | 5.3 mi |
| 12061 | East Greenbush | 9,854 | $111k | 5.9 mi |
| 12184 | Valatie | 7,787 | $99k | 7.5 mi |
| 12018 | Averill Park | 7,422 | $127k | 8.6 mi |
| 12130 | Niverville | 233 | $104k | 6.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.