Plainfield, New Hampshire Demographics & Population 2026

A note before these figures: with a population of 220, Plainfield's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Plainfield is a small community located in New Hampshire, within Sullivan County. The total population is 220. It ranks as the 94th most populous out of 100 Census-designated places in New Hampshire.

Age Demographics

The median age in Plainfield is 31.8 years. This is 27% lower than the state median of 43.3 years. 16.4% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Plainfield is $109,500. This is 11% higher than the state median of $99,031. It is also 36% higher than the national median of $80,734. The ACS records no residents below the poverty line in Plainfield. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Plainfield, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $455,600. Housing costs are 13% higher than the state median of $402,500. The home-value-to-income ratio is 4.2x. 56.8% of occupied housing units are owner-occupied. This homeownership rate is 22% lower than the state average of 72.8%.

Race & Ethnicity

Plainfield has a predominantly White (non-Hispanic) population, comprising 90.5% of all residents. Black or African American residents account for 4.1%. The Black or African American population is significantly higher than the state average (4.1% vs 1.3%).

Education

31.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 22% lower than the state rate of 40.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.7%.

Data Sources & Methodology

All demographic data for Plainfield, New Hampshire is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against New Hampshire state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 100 Census-designated places in New Hampshire. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.