ZIP Codes of Merrimack County, NH

Population & People
Population & People
Total Population
151,026
Household Income
Household Income
Median Income
$108,593
Housing
Housing
Total Housing Units
64,472
Business & Economy
Business & Economy
Total Businesses
4,132
Employment
Employment
Employment Rate
62.10%
Education
Education
Bachelor's Degree+
39.40%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 30 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:30 ZIP Codes (24 Standard, 5 PO Box, 1 Unique) [See All]
Area Code:603
Timezone:Eastern (GMT -05:00)
Local Time:2:13:09 PM
Population:151,026 [See All]
FIPS:33013
CBSA:Concord, NH
Land Area:928 sq mi
Water Area:22 sq mi
Coordinates:43.3060, -71.6952
Quick Link:
https://www.zip-codes.com/county/nh-merrimack.asp
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Top 3 most populous in New Hampshire
#3 of 11 counties in New Hampshire, with 151,026 residents.
Striking education divide
Bachelor's share spans 17.5% to 64.7% — a 47-point gap.

Standout ZIPs in this County


Most Populous
Concord · 33,995 people
22.5% of county total
Highest Income
Bow · $172,857 median
1.6× county average
Largest Land Area
Concord · 67.2 sq mi
Spans the most ground
Fastest Growth
Henniker · 28.5% (10-yr)
4,822 → 6,197 residents
Most Educated
New London · 64.7% bachelor's+
1,887 of 2,918 adults 25+

Things worth knowing about Merrimack County


151,026 residents live across 30 ZIPs covering 928 sq mi, served by 27 distinct USPS-recognized cities.

Population moved from 141,970 to 151,026 from 2014 to 2024 — a +6.4% change. 22 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 03304 (Bow, $172,857 median) and poorest ZIP 03230 (Danbury, $71,685) are 33.3 miles apart — a 2.4× income gap across local geography.

Median home values vary 2.3× across this county — from $240,700 in 03230 (Danbury) to $559,000 in 03257 (New London).

Density varies 19× across the county — from 33 people/sq mi in 03243 (Hill) to 627 in 03301 (Concord).

Educational attainment ranges from 17.5% bachelor's+ in 03230 (Danbury) to 64.7% in 03257 (New London) — the breadth of educational profiles across the area.

Within New Hampshire, this is the #3 most populous of 11 counties and ranks #3 for median household income with the #5 fastest decade growth .

Hosts 1 single-entity Unique ZIP: 03305Nh Dept Of Safety .

Weighted by population, the typical household earns about $100,344 across the county — reflecting what a typical resident sees, not a simple ZIP average.

39.4% of adults age 25+ hold a bachelor's degree or higher (43,210 of 109,681 reporting).

24 Standard delivery, 5 PO Box only, 1 single-entity Unique ZIPs serve this county.

Stories about Merrimack County


Higher-education hub

2 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.

New London
64.7%
4,484 residents
Bow
60.3%
8,335 residents

All ZIP Codes in Merrimack County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
03301ConcordStandard33,995$86,84054.24.6%
03303ConcordStandard16,571$80,45667.24.4%
03106HooksettStandard15,032$118,44232.910.7%
03275SuncookStandard12,205$82,91046.36.8%
03235FranklinStandard8,903$71,77532.03.9%
03304BowStandard8,335$172,85728.79.5%
03242HennikerStandard6,197$95,20643.228.5%
03229ContoocookStandard6,046$137,38645.18.1%
03307LoudonStandard5,724$107,22647.57.1%
03234EpsomStandard4,939$97,94134.56.7%
03257New LondonStandard4,484$107,00029.8-3.6%
03263PittsfieldStandard4,105$74,31824.90.6%
03046DunbartonStandard3,097$124,34831.311.4%
03278WarnerStandard3,079$94,78365.54.3%
03258ChichesterStandard2,721$108,90621.37.9%
03224CanterburyStandard2,392$138,12543.94.4%
03221BradfordStandard2,200$109,80350.7-4.1%
03216AndoverStandard2,046$88,31141.1-3.2%
03255NewburyStandard2,015$117,04538.214.7%
03287WilmotStandard1,487$117,75930.615.6%
03268SalisburyStandard1,468$111,81831.113.8%
03230DanburyStandard1,451$71,68538.99.6%
03260North SuttonPO Box976$117,00017.331.5%
03243HillStandard952$83,33328.7-18.2%
03273South SuttonPO Box361$187,9793.712.1%
03233ElkinsStandard156$120,1560.03.3%
03231East AndoverPO Box890.0-71.7%
03272South NewburyPO Box0.0
03305ConcordUnique0.0
03302ConcordPO Box0.0

Adjacent & Nearby Counties