Newmarket, NH ZIP Codes
One ZIP code serves Newmarket, New Hampshire: 03857. Together they are home to 9,463 residents in 4,345 households. That is more than the 5,679 people counted inside Newmarket Census-designated place, because these ZIP codes reach past its boundary.
Newmarket Census-designated place
| Measure | Census figure |
|---|---|
| Residents | 5,679 |
| Households | 2,840 |
| Median household income | $87,196 |
| Median home value | $423,500 |
| Median age | 38.3 |
| Median rent | $1,701 |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 9,463 |
| Households (sum of ZIP codes) | 4,345 |
| Median household income, range across ZIP codes | $100,845 (03857) to $100,845 (03857) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $100,845 |
| Homeowners | 52.9% |
| Households with kids under 18 | 21.6% |
| Moved in the past year | 13.9% |
| Carrier routes in EDDM2GO's route library | 7 routes, 4,611 homes (1 of 1 ZIP codes) |
Every ZIP code in Newmarket
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 03857 | Newmarket | 9,463 | 4,345 | $100,845 | $455,000 | 52.9% | 21.6% | 13.9% | 7 | 4,775 | 18% of its land; mailing city |
A ZIP code is listed for Newmarket when at least 10% of its land lies inside the Newmarket Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Newmarket. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Newmarket.
Counties
- Rockingham County — 36 ZIP codes
Price a mailing to Newmarket ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Newmarket, NH?
- 03857. A ZIP code is listed for Newmarket when at least 10% of its land lies inside the Newmarket Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Newmarket.
- What is the population of Newmarket, NH?
- The Census Bureau counts 5,679 residents inside Newmarket Census-designated place (ACS 2020–2024). The 1 ZIP code that serve Newmarket hold 9,463 residents in all.
- What is the median household income in Newmarket, NH?
- $87,196 inside Newmarket Census-designated place, per the Census Bureau. Across its ZIP codes the medians run from $100,845 to $100,845.
- How many carrier routes and mailboxes are in Newmarket, NH?
- For the 1 of 1 ZIP codes in EDDM2GO's stored route library: 7 carrier routes reaching 4,611 residential and 171 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.