Zip Code 08540
Princeton, New Jersey — Mercer County
📍 ZIP code 08540 is in Princeton, Mercer County, New Jersey.
ZIP code 08540 is located in Princeton, Mercer County, New Jersey. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 49,499. The area code for ZIP code 08540 is 609.
Quick Answer
Zip code 08540 is in Princeton, New Jersey (Mercer County). It has a population of 49,499, median household income of $169,898, and median home value of $723,400.
Population
49,499
Income
$169,898
Home Value
$723,400
Climate
87°F / 21°F
About Zip Code 08540
Zip code 08540 is located in Princeton, New Jersey, within Mercer County. Home to approximately 49,499 residents, this area sits at an elevation of 163 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 609.
The median household income is $169,898 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $723,400, and the cost of living index is 238 (138% above the national average of 100).
Summers average a high of 87°F while winters drop to 21°F. The area receives about 47 in of rain and 24 in of snow annually. The zip code covers 51.9 square miles of land area and 1 square miles of water.
Key Statistics
49,499
$169,898
$723,400
Eastern (EST/EDT)
609
163 ft
51.9 sq mi
40.1
19,255
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Compare With Nearby Zip Codes
| Metric | 08540 | 08542 | 08528 | 08553 | 08558 | 08536 |
|---|---|---|---|---|---|---|
| City | Princeton, NJ | Princeton, NJ | Kingston, NJ | Rocky Hill, NJ | Belle Mead, NJ | Plainsboro, NJ |
| Population | 49,499 | 2,415 | 331 | 814 | 7,236 | 20,558 |
| Median Income | $169,898 | $104,694 | $0 | $127,344 | $240,968 | $128,426 |
| Home Value | $723,400 | $754,800 | $234,600 | $608,200 | $853,300 | $655,100 |
| Cost of Living | 238 | 231 | 100 | 193 | 250 | 194 |
| Median Age | 40.1 | 41.7 | 68.1 | 42.8 | 47.9 | 36.7 |
Cost of Living
100 = National Average. Princeton's cost of living is 138% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.3x
Demographics
Zip code 08540 has a population of 49,499 people with a median age of 40.1. There are 19,255 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Princeton (08540) population trend from 2010 to 2024
↓ -38.5%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
87°F
21°F
47 in
24 in
Princeton experiences warm summers with average highs around 87°F. Winters are cool with lows averaging 21°F. The area receives about 24 in of snow per year.
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Housing & Economy
Median Home Value
$723,400
Median Household Income
$169,898
With 19,255 housing units across 51.9 square miles, 08540 has a housing density of 371 units per square mile. The home price-to-income ratio is 4.3x.
Location & Geography
Latitude
40.3630°
Longitude
-74.6553°
Land Area
51.9 sq mi
Water Area
1 sq mi
Nearby Zip Codes
Zip codes closest to 08540 (Princeton, NJ) with distances:
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 08540's $169,898. A way to compare Princeton to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 08540 (Princeton, NJ). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Princeton, New Jersey?
Princeton, New Jersey uses zip code 08540.
What county is zip code 08540 in?
Zip code 08540 is located in Mercer County, New Jersey.
What is the population of zip code 08540?
The population of zip code 08540 is 49,499 with a median age of 40.1.
Is 08540 in Princeton, New Jersey?
Yes, zip code 08540 is in Princeton, Mercer County, New Jersey. The area code is 609.
Frequently Asked Questions
What city is zip code 08540 in?
Zip code 08540 is in Princeton, New Jersey. It is part of Mercer County and uses the Eastern (EST/EDT) timezone.
What is zip code 08540?
Zip code 08540 is a U.S. postal code in Princeton, New Jersey (Mercer County). It has a population of 49,499 and covers 51.9 square miles.
What is the population of zip code 08540?
The population of zip code 08540 (Princeton, NJ) is 49,499 with a median age of 40.1. There are approximately 19,255 housing units in this area.
What is the median income in zip code 08540?
The median household income in zip code 08540 (Princeton, NJ) is $169,898 per year. The cost of living index is 238 (100 = national average).
What is the average home price in zip code 08540?
The median home value in zip code 08540 (Princeton, NJ) is $723,400. The cost of living index is 238 compared to the national average of 100.
What county is zip code 08540 in?
Zip code 08540 is located in Mercer County, New Jersey. The primary city is Princeton.
What is the area code for zip code 08540?
Zip code 08540 in Princeton, NJ uses area code 609. It is located in the Eastern (EST/EDT) timezone.
Is zip code 08540 a good place to live?
Zip code 08540 (Princeton, NJ) has a cost of living index of 238 (100 = national average), a median household income of $169,898, and median home values of $723,400. The median age is 40.1. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 08540?
The cost of living index for zip code 08540 (Princeton, NJ) is 238, where 100 represents the national average. This area is above the national average. Median home value: $723,400.
What schools serve zip code 08540?
Zip code 08540 in Princeton, New Jersey is served by the local school district of Mercer County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.