The 5 largest ethnic groups in Plainfield, IA are White (Non-Hispanic) (90.5%), Two+ (Non-Hispanic) (3.96%), Two+ (Hispanic) (3.96%), Native Hawaiian & Other Pacific Islander (Non-Hispanic) (0.792%), and White (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.