In 2023, Plainfield, IA had a population of 379 people with a median age of 43.4 and a median household income of $75,500. Between 2022 and 2023 the population of Plainfield, IA declined from 381 to 379, a −0.525% decrease and its median household income grew from $65,250 to $75,500, a 15.7% increase.
The 5 largest ethnic groups in Plainfield, IA are White (Non-Hispanic) (90.5%), Two Races Excluding Other, & Three or More Races (Non-Hispanic) (3.96%), Two Races Including Other (Hispanic) (3.96%), Native Hawaiian & Other Pacific Islander (Non-Hispanic) (0.792%), and American Indian & Alaska Native (Non-Hispanic) (0.264%).
None of the households in Plainfield, IA reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
99.7% of the residents in Plainfield, IA are U.S. citizens.
In 2023, the median property value in Plainfield, IA was $132,700, and the homeownership rate was 84.1%.
Most people in Plainfield, IA drove alone to work, and the average commute time was 22.1 minutes. The average car ownership in Plainfield, IA was 2 cars per household.