Zip Code 03854 — New Castle, NH

ZIP Code 03854 is associated with New Castle, NH, in Rockingham County. The listed population estimate is 827; estimated density is 394.9 people per square mile. Among records with population estimates, it ranks #34 of 35 in Rockingham County and #211 of 245 in NH.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (43.065580, -70.720030)

Data MetricLocal Statistic
Postal / Zip Code03854
Primary CityNew Castle
State / ProvinceNH
CountyRockingham
Total Population827
Population Density394.9 people/sq mi
TimezoneAmerica/New_York

How 03854 Compares

MetricZIP 03854Rockingham County recordsNH records
Population estimate827319,082 (sum)1,394,951 (sum)
Population Density394.9 /sq mi----
County population rank#34 of 35----
State population rank#211 of 245----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in NH

ZIP CodeCityDistancePopulation estimate
ZIP 03870Rye4.0 mi5,188
ZIP 03801Portsmouth4.3 mi23,484
ZIP 03871Rye Beach6.5 mi356
ZIP 03840Greenland6.7 mi4,106
ZIP 03862North Hampton8.2 mi4,610

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →