ZIP code 03857
Where is ZIP code 03857?
Newmarket, New Hampshire
Rockingham County · Standard ZIP code
ZIP code 03857 belongs to Newmarket, New Hampshire in Rockingham County. 03857 is a standard ZIP code, so it covers street addresses as well as PO Boxes. It is in the Eastern Time zone and uses area code 603. About 9,463 people live in the 03857 area, where the median household income is $100,845. The closest ZIP codes are 03856 (Newfields, 2.7 mi southwest), 03824 (Durham, 3.6 mi northeast) and 03861 (Lee, 3.8 mi northwest).
| ZIP code | 03857 |
|---|---|
| Type | Standard ZIP code for street addresses and PO Boxes |
| Status | Active |
| City | Newmarket |
| State | New Hampshire (NH) |
| County | Rockingham County |
| Time zone | Eastern Time · now |
| Area code | 603 |
| Coordinates | 43.0726, -70.9553 map |
| 3-digit prefix | 038 |
Population and income in 03857
| Population | 9,463 · higher than 85% of New Hampshire ZIP codes |
|---|---|
| People per square mile | 751 · higher than 91% of New Hampshire ZIP codes |
| Median age | 41.2 years · lower than 81% of New Hampshire ZIP codes |
| Men / women | 49% / 51% |
| Median household income | $100,845 · higher than 52% of New Hampshire ZIP codes |
| Income per person | $58,507 |
| Below the poverty line | 4.6% |
| Bachelor’s degree or higher | 50% of adults 25+ |
| Median home value | $455,000 · higher than 75% of New Hampshire ZIP codes |
| Median rent | $1,671 a month |
| Housing units | 4,500 |
| Households | 4,345 (2.17 people on average) |
| Owners / renters | 53% / 47% |
| Land area | 12.59 sq mi (plus 1.6 sq mi of water) |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 03857. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 03857
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 03856 | Newfields, NH | 2.7 mi SW | Standard |
| 03824 | Durham, NH | 3.6 mi NE | Standard |
| 03861 | Lee, NH | 3.8 mi NW | Standard |
| 03885 | Stratham, NH | 4.6 mi SE | Standard |
| 03843 | Hampton, NH | 5.5 mi SW | PO Box only |
| 03840 | Greenland, NH | 6 mi SE | Standard |
| 03833 | Exeter, NH | 6.3 mi S | Standard |
| 03042 | Epping, NH | 6.5 mi W | Standard |
| 03823 | Madbury, NH | 7 mi N | Standard |
| 03801 | Portsmouth, NH | 7.6 mi E | Standard |
| 03290 | Nottingham, NH | 8.5 mi NW | Standard |
| 03820 | Dover, NH | 8.7 mi NE | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 03857 or measure the distance to another ZIP code.
How to address mail to 03857
123 MAIN ST
NEWMARKET NH 03857
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (03857-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 03857?
- 03857 is a Newmarket, New Hampshire ZIP code.
- What county is 03857 in?
- ZIP code 03857 is in Rockingham County, New Hampshire.
- What time zone is ZIP code 03857 in?
- 03857 is in the Eastern Time zone (America/New_York).
- What area code is 03857?
- Phone numbers in ZIP code 03857 use area code 603.
- What is the population of ZIP code 03857?
- About 9,463 people live in ZIP code 03857, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 03857?
- The median household income in 03857 is $100,845 a year, higher than 52% of New Hampshire ZIP codes.
- What ZIP codes are near 03857?
- The nearest ZIP codes to 03857 are 03856 (Newfields, 2.7 miles), 03824 (Durham, 3.6 miles), 03861 (Lee, 3.8 miles) and 03885 (Stratham, 4.6 miles).