ZIP code profile · 2024 county data

ZIP Code 03840

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

Data updated 2026-08-24

4,052
Population (ZIP)
5
Violent rate /100K (county)
3
Property rate /100K (county)

Is ZIP code 03840 safe? Honest data snapshot

ZIP code 03840 sits within Rockingham 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 03840 carries a Census-reported population of 4,052, ranking #29 of 36 ZIPs in Rockingham County, spread across 10.48 square miles (about 387 people per square mile). For a full breakdown of Rockingham County's crime categories and year-over-year trend, see the Rockingham County crime page linked below.

ZIP 03840 has no FBI-native crime rate (postal codes are not police jurisdictions). Figures above use the Rockingham County proxy where reported; see methodology for the ZCTA plurality map. Methodology.

ZIP 03840 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
$143,625
Median age
46.9 years
Owner-occupied homes
85%
Occupied homes
1,540

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

ZIP 03840 settlement vs Rockingham County

ZIP 03840 itself is about 387 people per Census sq mi across 10.5 sq mi (4,052 residents), a postal settlement fact independent of the county UCR proxy.

ZIP 03840 is about 1.3% of the county reporting population (4,052 of 314,176), so most of the denominator and submitted incidents sit outside this postal code.

Rockingham County leans on aggravated assault at 42% of reported offenses (mix index 3,247). ZIP 03840 has no separate FBI offense book.

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 03840

Similar county violent rate (~5/100K)

Similar Census population (~4,052)

County detail: Rockingham 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.