Residential delivery area · New Hampshire
ZIP Code 03031: Amherst, NH
ZIP code 03031 uses the postal name Amherst, New Hampshire and lies entirely in Hillsborough County (Census 2020 ZIP-county file). About 12,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $153,125 (Census Bureau, ACS 2020-2024). By Census place, 2% of its land lies in Amherst (a census-designated place); 98% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Amherst · its only residential ZIP
- County
- Hillsborough County
- Census places
- Amherst census-designated place
- Metro area
- Manchester-Nashua, NH
- House district
- NH-2 119th Congress
- State
- New Hampshire
- Time zone
- Eastern
- Land area
- 33.9 sq mi · 349 people per sq mi
Where is ZIP code 03031?
03031 centers on 42.875°, -71.601° and covers 33.9 square miles of land plus 0.5 of water. It borders 6 ZIP codes: 03054, 03057, 03110, 03055, 03070, 03049.
The map draws ZIP code areas only. For the streets inside 03031, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 03031 compare with the rest of Hillsborough County?
| Measure | 03031 | In Hillsborough County | In NH |
|---|---|---|---|
| People (ACS 2020-2024) | 11,849 | 14th of 34 | 32nd of 247 |
| Median household income | $153k | 7th of 33 | 15th of 158 |
| Median home value | $537k | 5th of 34 | 26th of 191 |
Its median household income is higher than in 97% of U.S. residential ZIP codes, and it is denser than 69% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 03031?
The 2020 Census counted 11,763 people in 03031; the ACS, which samples households over 2020-2024, estimates 11,849. Between the 2010 and 2020 censuses its population grew 4.6% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 11,849
- 2020 Census count
- 11,763+4.6% since 2010 (11,247)
- Households
- 4,563
- Median age
- 45.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 03031?
Of the 11,849 people the ACS estimates in 03031, 22.4% are under 18 and 20.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (92.7%).
- Under 1822.4%
- 18 to 6457.3%
- 65 and older20.3%
- White, not Hispanic92.7%
- Hispanic or Latino3.7%
- Other or two or more2.9%
- Asian, not Hispanic0.8%
- Black, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 03031 earn?
Median household income is $153,125 (ACS 2020-2024), the 7th highest of the 33 ranked ZIP codes in Hillsborough County. It is not measurably different from 2015-2019 ($171,068 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $153,125
- Income per person
- $74,400
- Below the poverty line
- 4.4%
- Unemployed (of the labor force)
- 1.5%
- Adults 25+ with a bachelor's degree
- 65.8%
- Adjusted gross income per tax return, 2022
- $164,9916,030 returns; wages 65% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 03031?
FHFA's house price index for 03031, built from repeat sales and appraisals of the same homes, rose 109% from 2015 to 2025 and rose 67% from 2020 to 2025, and moved +6.4% in 2025.
- Median home value (owners' estimate)
- $537,300
- Median gross rent
- $1,462
- Homes owned by their occupants
- 91.9%
- Housing units
- 4,578
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 03031?
408 business establishments had a location in this ZIP code in 2023, 20 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade62
- Professional, scientific, and technical services56
- Construction48
- Health care and social assistance38
- Other services (except public administration)36
- Manufacturing35
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 03031?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 03054 | Merrimack | 28,176 | $127k | 4.4 mi |
| 03057 | Mont Vernon | 2,709 | $156k | 5.3 mi |
| 03110 | Bedford | 23,746 | $167k | 5.3 mi |
| 03055 | Milford | 16,337 | $98k | 5.4 mi |
| 03070 | New Boston | 6,177 | $154k | 8.3 mi |
| 03049 | Hollis | 8,603 | $169k | 8.7 mi |
| 03052 | Litchfield | 8,499 | $162k | 7.0 mi (near) |
| 03063 | Nashua | 15,805 | $108k | 7.6 mi (near) |
| 03086 | Wilton | 4,258 | $114k | 8.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.