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ZIP codes in Merrimack County

34 ZIPs touch Merrimack County, New Hampshire. The blue dashed line is the county border; orange ZIPs reach into it.

34

ZIP codes

6

cross the county line

207,359

people in these ZIPs

10

counties in NH

Most people

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Merrimack County ZIP list

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Questions people actually ask

How many ZIP codes are in Merrimack County, New Hampshire?

34 ZIP codes reach into Merrimack County, including 3 PO Box or single-address ZIPs placed by the town they serve. 6 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Merrimack County has the most people?

03104 (Manchester) has about 35,237 residents, the most of any ZIP touching Merrimack County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Merrimack County and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Merrimack County. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from