Migration to and from Merrimack County, New Hampshire
Where Merrimack County residents came from and where they went over the 5-year window 2016-2020. Census ACS County-to-County Migration Flows, 2020 5-yr (frozen vintage).
Total inflow
10,534
people moved in (5-yr)
Total outflow
9,542
people moved out (5-yr)
Net migration
+992
inflow minus outflow
Top 10 counties people moved IN from
| Origin | State / Region | People (5-yr) |
|---|---|---|
| Hillsborough County | New Hampshire | 2,643 |
| Rockingham County | New Hampshire | 899 |
| Belknap County | New Hampshire | 769 |
| Grafton County | New Hampshire | 454 |
| Strafford County | New Hampshire | 391 |
| Middlesex County | Massachusetts | 383 |
| Kings County | New York | 377 |
| Sullivan County | New Hampshire | 309 |
| Essex County | Massachusetts | 245 |
| New London County | Connecticut | 239 |
Top 10 counties people moved OUT to
| Destination | State / Region | People (5-yr) |
|---|---|---|
| Hillsborough County | New Hampshire | 2,743 |
| Belknap County | New Hampshire | 598 |
| Grafton County | New Hampshire | 541 |
| Strafford County | New Hampshire | 531 |
| Rockingham County | New Hampshire | 504 |
| Middlesex County | Massachusetts | 450 |
| Sullivan County | New Hampshire | 403 |
| Cheshire County | New Hampshire | 197 |
| New York County | New York | 149 |
| Knox County | Maine | 138 |
Explore Merrimack County
- Business data for Merrimack CountyConstruction sector establishments, employment, payroll
- Cities in New HampshireACS demographic profiles for places statewide
- ZIP code lookupSearch demographic data by ZIP code
- Opportunity IndexRank counties by business growth potential
- Federal contracts in NHGovBids: RFPs, awards, NAICS matching
- New business filings in New HampshireNewFilings: fresh SOS registrations
Methodology
- Counts represent the number of people aged 1+ who reported a different residence at the survey reference date than they did one year earlier, aggregated across the 5-year sample window 2016-2020.
- Outbound (OUT) flows are reported less frequently than inbound (IN) because the survey captures the destination side of each move. Many county pairs have null OUT counts, which is normal.
- "Total inflow" sums the published MOVEDIN counts across all origin counties, including foreign-region inflows (Africa, Asia, Central America, etc.). It is not the same as net population change.
- Frozen vintage. The Census Bureau has not released a newer county-to-county migration flows file. The 2020 5-yr vintage (covering 2016-2020) is the latest available as of build date.
Source: U.S. Census Bureau, American Community Survey, County-to-County Migration Flows: 2016-2020. Vintage: 2020 5-yr. Generated: 2026-05-28. FIPS: 33013.