Data Last Updated: April 1, 2025

Middlesex County, NJ ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Middlesex, NJ.	49 ZIP Codes (37 General, 6 PO Box, 2 Unique, & 4 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Middlesex, 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, 732, 848, 908
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 Middlesex, 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.	863,162 [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.	34023
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.	New York-Newark-Jersey City, NY-NJ
Land Area: The approximate amount of land area covered by Middlesex, 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.	309 square miles
Water Area: The approximate amount of water area covered by Middlesex, 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.	14 square miles
Coordinates: The latitude/longitude centroid coordinates for Middlesex County, NJ.	-74.411744, 40.439147
Quick Link: Copy the direct link to the Middlesex, NJCounty page and use anywhere you like!	https://www.zip-codes.com/county/nj-middlesex.asp

Middlesex, NJ ZIP Code Boundaries

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Middlesex County, NJ Covers 49 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 07001	General	Avenel	16,920	1.96%
ZIP Code 07008	General	Carteret	25,342	2.94%
ZIP Code 07064	General	Port Reading	3,905	0.45%
ZIP Code 07067	General	Colonia	18,609	2.16%
ZIP Code 07077	General	Sewaren	2,885	0.33%
ZIP Code 07080	General	South Plainfield	24,261	2.81%
ZIP Code 07095	General	Woodbridge	19,839	2.30%
ZIP Code 07726 *	General	Englishtown	44,945	--
ZIP Code 07735 *	General	Keyport	18,652	--
ZIP Code 07747 *	General	Matawan	31,915	--
ZIP Code 08512	General	Cranbury	12,897	1.49%
ZIP Code 08536	General	Plainsboro	20,682	2.40%
ZIP Code 08540 *	General	Princeton	48,216	--
ZIP Code 08810	General	Dayton	8,170	0.95%
ZIP Code 08812	General	Dunellen	14,593	1.69%
ZIP Code 08816	General	East Brunswick	48,729	5.65%
ZIP Code 08817	General	Edison	48,243	5.59%
ZIP Code 08818	P.O. Box	Edison	0	0.00%
ZIP Code 08820	General	Edison	41,169	4.77%
ZIP Code 08824	General	Kendall Park	13,300	1.54%
ZIP Code 08828	General	Helmetta	2,455	0.28%
ZIP Code 08830	General	Iselin	20,088	2.33%
ZIP Code 08831	General	Monroe Township	55,123	6.39%
ZIP Code 08832	General	Keasbey	3,027	0.35%
ZIP Code 08837	General	Edison	18,463	2.14%
ZIP Code 08840	General	Metuchen	17,841	2.07%
ZIP Code 08846	General	Middlesex	14,636	1.70%
ZIP Code 08850	General	Milltown	8,325	0.96%
ZIP Code 08852	General	Monmouth Junction	18,956	2.20%
ZIP Code 08854	General	Piscataway	60,545	7.01%
ZIP Code 08855	P.O. Box	Piscataway	0	0.00%
ZIP Code 08857	General	Old Bridge	40,675	4.71%
ZIP Code 08859	General	Parlin	24,666	2.86%
ZIP Code 08861	General	Perth Amboy	58,039	6.72%
ZIP Code 08862	P.O. Box	Perth Amboy	0	0.00%
ZIP Code 08863	General	Fords	12,939	1.50%
ZIP Code 08871	P.O. Box	Sayreville	0	0.00%
ZIP Code 08872	General	Sayreville	20,351	2.36%
ZIP Code 08879	General	South Amboy	22,965	2.66%
ZIP Code 08882	General	South River	16,118	1.87%
ZIP Code 08884	General	Spotswood	8,185	0.95%
ZIP Code 08899	General	Edison	0	0.00%
ZIP Code 08901	General	New Brunswick	56,278	6.52%
ZIP Code 08902	General	North Brunswick	43,296	5.02%
ZIP Code 08903	P.O. Box	New Brunswick	0	0.00%
ZIP Code 08904	General	Highland Park	15,072	1.75%
ZIP Code 08906	P.O. Box	New Brunswick	0	0.00%
ZIP Code 08933	Unique	New Brunswick	0	0.00%
ZIP Code 08989	Unique	New Brunswick	0	0.00%

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

Important Middlesex, NJ Information

Middlesex County, NJ Covers 49 ZIP Codes. This includes 37 General ZIP Codes, 6 PO Box ZIP Codes, and 2 Unique (reserved for Business and Volume Mail Receivers). There are also 4 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Middlesex County.

The population for Middlesex County is 863,162, according to the U.S. Census. Population Density is 2,793.40 persons per square mile. With 315,521 Housing Units, the Average Household Size is 2.80 persons. There are 300,547 Family Households with an Average Family Size of 2.99 persons. 6.47% of the population is without Health Insurance. The 62.58% Employment Rate is 2.78% above the national average of 59.8%.594,249 people aged 25+ have some educational achievement, with 45.13% (or 268,170 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 5 area codes serving this area including609, 640, 732, 848 and 908. Middlesex is also located in the Eastern timezone and the current local time is shown above.

Middlesex is part of the New York-Newark-Jersey City, NY-NJ Core Based Statistical Area (CBSA). Its CBSA Code is 35620.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 Middlesex, NJ have 311,603 Residential mailboxes and 21,176 Business mailboxes.There are 21,848 businesses with a total of 411,552 employees. That is an average of 18.8 employees per business. Annual payroll for these businesses is $29,168,094,000. Other Demographics

Middlesex County Demographic Profile

Population & People

Total Population

863,162

Income

Median Household Income

$109,028

Housing

Total Housing Units

315,521

Health

Without Healthcare Coverage

6.47%

Business & Economy

Total Businesses

21,848

Families

Total Households

300,547

Employment

Employment Rate

62.58%

Education

Bachelor's Degree or Higher

45.13%

Total Population: Total number of people from the 2020 U.S. Census for Middlesex, 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.	863,162
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Middlesex, 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.	869,953
Total Households: Total number of Households from the 2020 U.S. Census for Middlesex, NJ. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	300,547
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.	315,521
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.	2.80
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.	2.99

Other Middlesex Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	311,603
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	21,176
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.	399,793
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	207,767
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	26,527

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	21,848
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$7,431,601,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$29,168,094,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	411,552

Sum of all ZIP Codes assigned Middlesex, 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