ZIP code profile · 2024 county data

ZIP Code 03257

Merrimack County, New Hampshire: Census demographics for this ZIP plus the containing county's FBI UCR crime rate.

Data updated 2026-08-24

4,381
Population (ZIP)
1
Violent rate /100K (county)
1
Property rate /100K (county)

Is ZIP code 03257 safe? Honest data snapshot

ZIP code 03257 sits within Merrimack County, NH, in which law-enforcement agencies did not report complete 2024 data to the FBI UCR Program. The county figures below cover only the agencies that submitted, so they are not a measure of crime in this area and no comparison to the national average is drawn from them.

ZIP 03257 carries a Census-reported population of 4,381, ranking #12 of 28 ZIPs in Merrimack County, spread across 23.55 square miles (about 186 people per square mile). For a full breakdown of Merrimack County's crime categories and year-over-year trend, see the Merrimack County crime page linked below.

ZIP 03257 has no FBI-native crime rate (postal codes are not police jurisdictions). Figures above use the Merrimack County proxy where reported; see methodology for the ZCTA plurality map. Methodology.

ZIP 03257 Census context

These are ZIP/ZCTA demographic estimates, separate from the county-level FBI proxy above. They describe the local settlement, not a crime rate.

Median household income
$84,891
Median age
50.7 years
Owner-occupied homes
91%
Occupied homes
1,630

Source: U.S. Census Bureau, ACS 2022 5-year ZCTA estimates (income, age, and occupied housing tenure).

ZIP 03257 settlement vs Merrimack County

ZIP 03257 itself is about 186 people per Census sq mi across 23.6 sq mi (4,381 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 03257 accounts for roughly 2.8% of the county reporting population (4,381 of 153,808).

Merrimack County's 2024 UCR book concentrates in rape (67% of 3 offenses; mix index 5,556). ZIP 03257 inherits that county mix, not a postal-native split.

Settlement lines use Census ZCTA figures only; incomplete county agency coverage blocks any UCR mix or rate desk for this ZIP.

Nationwide peers for ZIP 03257

Similar county violent rate (~1/100K)

Similar Census population (~4,381)

County detail: Merrimack County · State atlas: New Hampshire

Sources: U.S. Census Bureau (ZIP population, land area, 2020 ZCTA-to-county relationship file, ACS 5-year estimates) and FBI Uniform Crime Reporting (UCR) Program, Crime in the United States (CIUS) Table 10 (county-level crime, attributed via ZIP-to-county crosswalk).

Verify with Census.gov Geography and FBI.gov UCR.

Read our methodology , how this data is sourced, computed, and verified.

Every figure on PlainCrime is rendered directly from FBI Uniform Crime Reporting (UCR) source data, no number is typed in by an editor. This page combines Census ZIP-level figures with a ZIP-to-county crosswalk to attribute FBI UCR crime data honestly, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.