Data Last Updated: April 1, 2025

Mercer County, NJ ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Mercer, NJ.	44 ZIP Codes (20 General, 11 PO Box, 7 Unique, & 6 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Mercer, NJ. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	609, 640
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Eastern
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Mercer, NJ from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	387,340 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	34021
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Trenton-Princeton, NJ
Land Area: The approximate amount of land area covered by Mercer, NJ in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	224 square miles
Water Area: The approximate amount of water area covered by Mercer, NJ in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	4 square miles
Coordinates: The latitude/longitude centroid coordinates for Mercer County, NJ.	-74.701775, 40.283433
Quick Link: Copy the direct link to the Mercer, NJCounty page and use anywhere you like!	https://www.zip-codes.com/county/nj-mercer.asp

Mercer, NJ ZIP Code Boundaries

Download ZIP Code Database

Load Mercer County, NJ Map

Mercer County, NJ Covers 44 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 08501 *	General	Allentown	6,574	--
ZIP Code 08512 *	General	Cranbury	12,897	--
ZIP Code 08515 *	General	Chesterfield	6,344	--
ZIP Code 08520	General	Hightstown	29,291	7.56%
ZIP Code 08525	General	Hopewell	4,649	1.20%
ZIP Code 08530 *	General	Lambertville	7,832	--
ZIP Code 08534	General	Pennington	12,955	3.34%
ZIP Code 08535 *	General	Millstone Township	5,273	--
ZIP Code 08540	General	Princeton	48,216	12.45%
ZIP Code 08541	Unique	Princeton	0	0.00%
ZIP Code 08542	General	Princeton	3,325	0.86%
ZIP Code 08543	P.O. Box	Princeton	0	0.00%
ZIP Code 08544	Unique	Princeton	4,349	1.12%
ZIP Code 08550	General	Princeton Junction	21,034	5.43%
ZIP Code 08558 *	General	Skillman	7,754	--
ZIP Code 08560	General	Titusville	3,553	0.92%
ZIP Code 08561	P.O. Box	Windsor	330	0.09%
ZIP Code 08601	P.O. Box	Trenton	0	0.00%
ZIP Code 08602	P.O. Box	Trenton	0	0.00%
ZIP Code 08603	P.O. Box	Trenton	0	0.00%
ZIP Code 08604	P.O. Box	Trenton	0	0.00%
ZIP Code 08605	P.O. Box	Trenton	0	0.00%
ZIP Code 08606	P.O. Box	Trenton	0	0.00%
ZIP Code 08607	P.O. Box	Trenton	0	0.00%
ZIP Code 08608	General	Trenton	1,269	0.33%
ZIP Code 08609	General	Trenton	14,867	3.84%
ZIP Code 08610	General	Trenton	32,649	8.43%
ZIP Code 08611	General	Trenton	31,531	8.14%
ZIP Code 08618	General	Trenton	37,544	9.69%
ZIP Code 08619	General	Trenton	23,301	6.02%
ZIP Code 08620	General	Trenton	14,633	3.78%
ZIP Code 08625	P.O. Box	Trenton	0	0.00%
ZIP Code 08628	General	Trenton	10,310	2.66%
ZIP Code 08629	General	Trenton	13,359	3.45%
ZIP Code 08638	General	Trenton	23,548	6.08%
ZIP Code 08645	Unique	Trenton	0	0.00%
ZIP Code 08646	Unique	Trenton	0	0.00%
ZIP Code 08647	Unique	Trenton	0	0.00%
ZIP Code 08648	General	Lawrence Township	31,955	8.25%
ZIP Code 08650	P.O. Box	Trenton	0	0.00%
ZIP Code 08666	Unique	Trenton	0	0.00%
ZIP Code 08690	General	Trenton	19,470	5.03%
ZIP Code 08691	General	Robbinsville	16,866	4.35%
ZIP Code 08695	Unique	Trenton	0	0.00%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Mercer, NJ, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Mercer, NJ Information

Mercer County, NJ Covers 44 ZIP Codes. This includes 20 General ZIP Codes, 11 PO Box ZIP Codes, and 7 Unique (reserved for Business and Volume Mail Receivers). There are also 6 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Mercer County.

The population for Mercer County is 387,340, according to the U.S. Census. Population Density is 1,729.20 persons per square mile. With 150,442 Housing Units, the Average Household Size is 2.64 persons. There are 139,361 Family Households with an Average Family Size of 3.12 persons. 6.83% of the population is without Health Insurance. The 60.22% Employment Rate is 0.42% above the national average of 59.8%.259,529 people aged 25+ have some educational achievement, with 44.90% (or 116,529 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 2 area codes serving this area including609 and 640. Mercer is also located in the Eastern timezone and the current local time is shown above.

Mercer is part of the Trenton-Princeton, NJ Core Based Statistical Area (CBSA). Its CBSA Code is 45940.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Mercer, NJ have 150,754 Residential mailboxes and 10,729 Business mailboxes.There are 10,471 businesses with a total of 216,508 employees. That is an average of 20.7 employees per business. Annual payroll for these businesses is $18,247,859,000. Other Demographics

Mercer County Demographic Profile

Population & People

Total Population

387,340

Income

Median Household Income

$96,333

Housing

Total Housing Units

150,442

Health

Without Healthcare Coverage

6.83%

Business & Economy

Total Businesses

10,471

Families

Total Households

139,361

Employment

Employment Rate

60.22%

Education

Bachelor's Degree or Higher

44.90%

Total Population: Total number of people from the 2020 U.S. Census for Mercer, NJ. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	387,340
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Mercer, NJ. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	396,798
Total Households: Total number of Households from the 2020 U.S. Census for Mercer, NJ. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	139,361
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	150,442
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.64
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	3.12

Other Mercer Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	150,754
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	10,729
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	200,815
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	106,781
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	15,538

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	10,471
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$5,156,461,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$18,247,859,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	216,508

Sum of all ZIP Codes assigned Mercer, NJ as their primary County.

References

U.S. Postal Service [Last Updated: 4/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 4/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov