Data Last Updated: July 1, 2025

Merrimack County, NH ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Merrimack, NH.	34 ZIP Codes (24 General, 5 PO Box, 1 Unique, & 4 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Merrimack, NH. 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.	603
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 Merrimack, NH 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.	153,808 [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.	33013
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.	Concord, NH
Land Area: The approximate amount of land area covered by Merrimack, NH 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.	933 square miles
Water Area: The approximate amount of water area covered by Merrimack, NH 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.	22 square miles
Coordinates: The latitude/longitude centroid coordinates for Merrimack County, NH.	-71.680220, 43.297464
Quick Link: Copy the direct link to the Merrimack, NHCounty page and use anywhere you like!	https://www.zip-codes.com/county/nh-merrimack.asp

Merrimack, NH ZIP Code Boundaries

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Merrimack County, NH Covers 34 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 03046	General	Dunbarton	3,005	1.95%
ZIP Code 03104 *	General	Manchester	34,324	--
ZIP Code 03106	General	Hooksett	14,799	9.62%
ZIP Code 03216	General	Andover	2,327	1.51%
ZIP Code 03220 *	General	Belmont	7,368	--
ZIP Code 03221	General	Bradford	2,307	1.50%
ZIP Code 03224	General	Canterbury	2,368	1.54%
ZIP Code 03229	General	Contoocook	5,919	3.85%
ZIP Code 03230	General	Danbury	1,256	0.82%
ZIP Code 03231	P.O. Box	East Andover	85	0.06%
ZIP Code 03233	General	Elkins	115	0.07%
ZIP Code 03234	General	Epsom	4,817	3.13%
ZIP Code 03235	General	Franklin	8,856	5.76%
ZIP Code 03242	General	Henniker	6,185	4.02%
ZIP Code 03243	General	Hill	1,076	0.70%
ZIP Code 03255	General	Newbury	2,158	1.40%
ZIP Code 03257	General	New London	4,513	2.93%
ZIP Code 03258	General	Chichester	2,625	1.71%
ZIP Code 03260	P.O. Box	North Sutton	798	0.52%
ZIP Code 03261 *	General	Northwood	4,685	--
ZIP Code 03263	General	Pittsfield	4,094	2.66%
ZIP Code 03268	General	Salisbury	1,236	0.80%
ZIP Code 03272	P.O. Box	South Newbury	0	0.00%
ZIP Code 03273	P.O. Box	South Sutton	259	0.17%
ZIP Code 03275	General	Suncook	11,946	7.77%
ZIP Code 03276 *	General	Tilton	8,766	--
ZIP Code 03278	General	Warner	3,126	2.03%
ZIP Code 03287	General	Wilmot	1,407	0.91%
ZIP Code 03301	General	Concord	33,352	21.68%
ZIP Code 03302	P.O. Box	Concord	0	0.00%
ZIP Code 03303	General	Concord	16,516	10.74%
ZIP Code 03304	General	Bow	8,229	5.35%
ZIP Code 03305	Unique	Concord	0	0.00%
ZIP Code 03307	General	Loudon	5,600	3.64%

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

Important Merrimack, NH Information

Merrimack County, NH Covers 34 ZIP Codes. This includes 24 General ZIP Codes, 5 PO Box ZIP Codes, and 1 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 Merrimack County.

The population for Merrimack County is 153,808, according to the U.S. Census. Population Density is 164.85 persons per square mile. With 65,565 Housing Units, the Average Household Size is 2.41 persons. There are 60,420 Family Households with an Average Family Size of 2.91 persons. 4.29% of the population is without Health Insurance. The 62.52% Employment Rate is 2.72% above the national average of 59.8%.112,062 people aged 25+ have some educational achievement, with 38.08% (or 42,673 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

603 is the only area code for this area. Merrimack is also located in the Eastern timezone and the current local time is shown above.

Merrimack is part of the Concord, NH Core Based Statistical Area (CBSA). Its CBSA Code is 18180.It is classified as a micro area, which means it has an urban core of at least 10,000 but less then 50,000 people.

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more 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 Merrimack, NH have 58,757 Residential mailboxes and 4,163 Business mailboxes.There are 4,167 businesses with a total of 59,894 employees. That is an average of 14.4 employees per business. Annual payroll for these businesses is $3,387,420,000. Other Demographics

Merrimack County Demographic Profile

Population & People

Total Population

153,808

Income

Median Household Income

$93,944

Housing

Total Housing Units

65,565

Health

Without Healthcare Coverage

4.29%

Business & Economy

Total Businesses

4,167

Families

Total Households

60,420

Employment

Employment Rate

62.52%

Education

Bachelor's Degree or Higher

38.08%

Total Population: Total number of people from the 2020 U.S. Census for Merrimack, NH. 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.	153,808
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Merrimack, NH. 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.	141,597
Total Households: Total number of Households from the 2020 U.S. Census for Merrimack, NH. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	60,420
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.	65,565
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.	2.41
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.	2.91

Other Merrimack Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	58,757
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	4,163
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.	75,343
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	46,254
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	7,617

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	4,167
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$768,292,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$3,387,420,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	59,894

Sum of all ZIP Codes assigned Merrimack, NH as their primary County.

References

U.S. Postal Service [Last Updated: 7/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 7/1/2025], 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