Zip Code 03781 — Plainfield, NH

ZIP Code 03781 is associated with Plainfield, NH, in Sullivan County. The listed population estimate is 1,918; estimated density is 15.5 people per square mile. Among records with population estimates, it ranks #6 of 15 in Sullivan County and #152 of 245 in NH.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (43.552600, -72.283990)

Data MetricLocal Statistic
Postal / Zip Code03781
Primary CityPlainfield
State / ProvinceNH
CountySullivan
Total Population1,918
Population Density15.5 people/sq mi
TimezoneAmerica/New_York

How 03781 Compares

MetricZIP 03781Sullivan County recordsNH records
Population estimate1,91842,802 (sum)1,394,951 (sum)
Population Density15.5 /sq mi----
County population rank#6 of 15----
State population rank#152 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 03770Meriden1.6 mi604
ZIP 03745Cornish5.7 mi1,816
ZIP 03784West Lebanon5.9 mi3,804
ZIP 03766Lebanon6.1 mi11,195
ZIP 03753Grantham7.3 mi3,509

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 →