Plainfield, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Plainfield, IL Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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A
Health Above average
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A+
Income Top grade
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A+
Education Top grade
Source: Map AI Methodology
Population
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 35,278 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 1309.7 | 219.1 | 86.4 |
| Population growth (%/yr) | 0.69% | -0.16% | 0.59% |
| Median age | 35.3 | 37.4 | 37.3 |
| Households | 11,141 | 5,035,584 | 130,235,071 |
Population in Plainfield declined by 7.5% from 2009 to 2024, reaching 35,278 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Plainfield is Gen X, aged 45–60, at 23.0% of residents. That is 2.6 points above Illinois as a whole.
- Gen Z 13–28 7,536 21.4% +0.1 pts
- Millennials 29–44 8,089 22.9% +1.1 pts
- Gen X 45–60 8,097 23.0% +2.6 pts
- Boomers 61–79 3,723 10.6% -6.4 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Illinois, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 49.4% of the people living in Plainfield and men 50.6%.
- Women 49.4% Illinois 50.6%
- Men 50.6% Illinois 49.4%
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100% of everyone living in Plainfield
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Economy
Plainfield has a the economy index of A+, which means it is exceptionally prosperous.
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $142,029 | $84,042 | $80,455 |
| Income growth (%/yr) | 3.33% | 4.46% | 4.80% |
| Unemployment rate | 4.5% | 5.8% | 5.2% |
The median household income in Plainfield is about 69% higher than in Illinois.
Housing
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $364,824 | $149,936 | $248,835 |
| Median rent | $2,084 | $1,274 | $1,407 |
| Homeownership rate | 88.5% | 67.1% | 65.2% |
The median home price in Plainfield is about 14.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $2,084 per month for that long.
Commute Time & Mobility
Commuters in Plainfield spend about 63 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 262 hours, about 10.9 full days, spent commuting.
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 31.5 | 23.6 | 22.4 |
| Round-trip commute (min) | 63.0 | 47.3 | 44.8 |
| Yearly time spent (hours) | 262 | 197 | 187 |
| Estimated yearly cost | $8,134 | $6,104 | $5,790 |
| Work from home | 22.4% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 22,946 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 3,414 | 1,547 | 1,355 |
The average commute time in Plainfield is 31 minutes, longer than the 24 minutes in Illinois.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Plainfield has a education index of A+, which means it is exceptionally educated.
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 46.8% | 34.1% | 31.6% |
| Average household size | 3.14 | 2.46 | 2.53 |
Health
Plainfield has a health index of A, which means it is very healthy.
| Metric | Plainfield | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.6 | 77.9 | 78.3 |
| Self-rated poor health | 9.7% | 15.6% | 16.3% |
| Smokers | 13.6% | 19.2% | 19.0% |
Plainfield, IL Compared With Nearby Cities
How Plainfield, IL compares with the 1 cities closest to it.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Plainfield, IL | 35,278 | $142,029 #1/2 | $364,824 #1/2 | 31.5 min #2/2 |
| Romeoville, IL | 36,499 | $102,094 | $317,182 | 30.6 min |
Frequently Asked Questions
Common questions about Plainfield, Illinois.
How big is Plainfield, Illinois by population?
About 35,278 people live in Plainfield, Illinois, in 11,141 households of 3.1 people on average. The median age is 35.3, so residents are younger than the U.S. median of 37.3 by about 2 years.
Is Plainfield, Illinois urban or rural?
Averaged over its land area, Plainfield, Illinois has 1,310 people per square mile, a density typical of urban and suburban areas. That is about 15 times the U.S. average of 86.
Can a typical household afford a home in Plainfield, Illinois?
The median home costs 2.6 times the median household income ($364,824 against $142,029), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $2,084 a month takes about 18% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
What share of adults in Plainfield, Illinois have a college degree?
46.8% of adults in Plainfield, Illinois hold a bachelor's degree or higher (about 1 in 2), well above the U.S. share of 31.6%.
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