ZIP Code Tabulation Area · New Hampshire

ZIP Code 03257: Merrimack County, NH

ZIP Code 03257 (Merrimack County, New Hampshire) has an estimated 4,484 residents in 1,650 households. The median household income is $107,000, the median home value is $559,000 and the median gross rent is $1,594/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Total population

4,484

Margin of error ±126

Median household income

$107,000

Margin of error ±$10,394

Median home value

$559,000

Margin of error ±$64,880

Median gross rent

$1,594/mo

Margin of error ±$551

Median age

50.9 yrs

Margin of error ±6.2 yrs

Mean travel time to work

24.9 min

Margin of error ±6.4 min

How ZIP 03257 compares with New Hampshire and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 0325750.9 yrsNew Hampshire43.3 yrsUnited States38.9 yrs

Median household income

ZIP 03257$107,000New Hampshire$99,031United States$80,734

Per capita income

ZIP 03257$53,645New Hampshire$52,798United States$44,673

Poverty rate

ZIP 032570.9%New Hampshire7.2%United States12.5%

Unemployment rate

ZIP 032573.7%New Hampshire3.3%United States5.2%

Bachelor's degree or higher

ZIP 0325764.7%New Hampshire40.6%United States35.7%

Median home value

ZIP 03257$559,000New Hampshire$402,500United States$332,700

Median gross rent

ZIP 03257$1,594/moNew Hampshire$1,491/moUnited States$1,413/mo

Owner-occupied homes

ZIP 0325790.6%New Hampshire72.8%United States65.2%

Mean travel time to work

ZIP 0325724.9 minNew Hampshire26.7 minUnited States26.4 min

Worked from home

ZIP 0325716.3%New Hampshire16.8%United States15.1%

All figures for ZIP 03257

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 03257 — ACS 2020–2024 5-year estimates
MeasureZIP 03257Margin of errorNew HampshireUnited States
Total population4,484±1261,394,868334,922,499
Median age50.9 yrs±6.2 yrs43.3 yrs38.9 yrs
Households1,650±126555,822129,227,496
Median household income$107,000±$10,394$99,031$80,734
Per capita income$53,645±$5,434$52,798$44,673
Poverty rate0.9%±0.6 pts7.2%12.5%
Unemployment rate3.7%±2.7 pts3.3%5.2%
Bachelor's degree or higher64.7%±7.9 pts40.6%35.7%
Median home value$559,000±$64,880$402,500$332,700
Median gross rent$1,594/mo±$551$1,491/mo$1,413/mo
Owner-occupied homes90.6%±3.9 pts72.8%65.2%
Mean travel time to work24.9 min±6.4 min26.7 min26.4 min
Worked from home16.3%±7.6 pts16.8%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 03257
GroupZIP 03257New HampshireUnited States
White alone, not Hispanic or Latino89.0%86.9%57.4%
Black or African American alone, not Hispanic or Latino1.2%1.3%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.1%0.5%
Asian alone, not Hispanic or Latino3.3%2.6%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.0%0.0%0.2%
Some other race alone, not Hispanic or Latino0.0%0.4%0.6%
Two or more races, not Hispanic or Latino3.8%4.0%4.3%
Hispanic or Latino (of any race)2.8%4.7%19.3%

Where ZIP 03257 is

State
New Hampshire
Main county
Merrimack County— also overlaps Sullivan County
Largest overlapping place
New London (5% of the ZIP's land area)
Land area
23.55 sq mi· about 190 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Merrimack County

03216 Merrimack County, NH03221 Merrimack County, NH03224 Merrimack County, NH03229 Merrimack County, NH03230 Merrimack County, NH03231 Merrimack County, NH03233 Merrimack County, NH03234 Merrimack County, NH03235 Franklin, NH03242 Merrimack County, NH03243 Merrimack County, NH03255 Merrimack County, NH03258 Merrimack County, NH03260 Merrimack County, NH03263 Merrimack County, NH03268 Merrimack County, NH03273 Merrimack County, NH03275 Merrimack County, NH03276 Merrimack County, NH03278 Merrimack County, NH03287 Merrimack County, NH03301 Concord, NH03303 Concord, NH03304 Merrimack County, NH

See every ZIP code in New Hampshire, or compare ZIP 03257 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.