Residential delivery area · New Jersey
ZIP Code 08550: Princeton Junction, NJ
ZIP code 08550 uses the postal name Princeton Junction, New Jersey and lies entirely in Mercer County (Census 2020 ZIP-county file). About 21,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $224,213 (Census Bureau, ACS 2020-2024). Its land lies mostly outside any Census place; 5% is in small places.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Princeton Junction · its only residential ZIP
- County
- Mercer County
- Metro area
- Trenton-Princeton, NJ
- House district
- NJ-12 119th Congress
- State
- New Jersey
- Time zone
- Eastern
- Land area
- 19.1 sq mi · 1,101 people per sq mi
Where is ZIP code 08550?
08550 centers on 40.280°, -74.622° and covers 19.1 square miles of land plus 0.6 of water. It borders 7 ZIP codes: 08536, 08690, 08520, 08648, 08691, 08512, 08540.
The map draws ZIP code areas only. For the streets inside 08550, 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 08550 compare with the rest of Mercer County?
| Measure | 08550 | In Mercer County | In NJ |
|---|---|---|---|
| People (ACS 2020-2024) | 21,067 | 9th of 26 | 164th of 598 |
| Median household income | $224k | 2nd of 22 | 24th of 476 |
| Median home value | $807k | 2nd of 22 | 63rd of 515 |
Its median household income is higher than in 99% of U.S. residential ZIP codes, and it is denser than 79% 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 08550?
The 2020 Census counted 21,034 people in 08550; the ACS, which samples households over 2020-2024, estimates 21,067. Between the 2010 and 2020 censuses its population grew 8.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 21,067
- 2020 Census count
- 21,034+8.2% since 2010 (19,445)
- Households
- 7,817
- Median age
- 45.4
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 08550?
Of the 21,067 people the ACS estimates in 08550, 22.5% are under 18 and 17.8% are 65 or older. The largest group by race and Hispanic origin is Asian (not Hispanic) (55.0%), then White (not Hispanic) (33.2%).
- Under 1822.5%
- 18 to 6459.7%
- 65 and older17.8%
- Asian, not Hispanic55.0%
- White, not Hispanic33.2%
- Other or two or more5.5%
- Hispanic or Latino4.8%
- Black, not Hispanic1.5%
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 08550 earn?
Median household income is $224,213 (ACS 2020-2024), the 2nd highest of the 22 ranked ZIP codes in Mercer County. It is not measurably different from 2015-2019 ($235,866 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $224,213±$24,448
- Income per person
- $100,495
- Below the poverty line
- 2.5%
- Unemployed (of the labor force)
- 2.7%
- Adults 25+ with a bachelor's degree
- 85.5%
- Adjusted gross income per tax return, 2022
- $249,2389,470 returns; wages 73% 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 08550?
FHFA's house price index for 08550, built from repeat sales and appraisals of the same homes, rose 66% from 2015 to 2025 and rose 60% from 2020 to 2025, and moved +5.5% in 2025.
- Median home value (owners' estimate)
- $807,200
- Median gross rent
- $2,584
- Homes owned by their occupants
- 76.1%
- Housing units
- 7,941
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 08550?
448 business establishments had a location in this ZIP code in 2023, 13 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services159
- Health care and social assistance59
- Accommodation and food services36
- Other services (except public administration)36
- Educational services25
- Retail trade20
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 08550?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 08536 | Plainsboro | 20,817 | $138k | 4.1 mi |
| 08690 | Trenton | 18,841 | $127k | 4.2 mi |
| 08520 | Hightstown | 29,504 | $118k | 4.6 mi |
| 08648 | Lawrence Township | 31,323 | $126k | 5.0 mi |
| 08691 | Trenton | 16,607 | $133k | 5.1 mi |
| 08512 | Cranbury | 12,928 | $119k | 5.9 mi |
| 08540 | Princeton | 50,388 | $177k | 6.1 mi |
| 08561 | Windsor | 325 | – | 3.1 mi (near) |
| 08619 | Trenton | 24,089 | $106k | 4.7 mi (near) |
| 08544 | Princeton | 4,392 | – | 5.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.