Plainfield is a city in Illinois, with a population of 50,043 and about 1,914 residents per square mile. The median household earns $144,000 a year, and the median home is worth $431,400.
Conditions
Humidity & wind
—
UV index
—
Sunrise & sunset
—
Local time
—
Size & density
Land area
26 sq mi
Water excluded
Population density
1,914
People per square mile
Rank by population
#893
Of cities on this site
Rank by area
#527
Of cities on this site
Money & housing
Median household income
$144,000
US median ≈ $78,538
Median gross rent
$2,119
Per month
Homeownership
88%
US ≈ 65%
Average commute
33.3 min
One way
People
Median age
37.5
US median 39.1
Bachelor's degree +
56%
Age 25 and over
Foreign born
14.7%
Households
14,634
3.17 people each
Climate · 2021–2025 average
Clear days21/yrMostly or fully clear sky
Days with rain154/yr0.01 in or more
Days with snow41/yr
Days above 90°9/yr
Below freezing112/yr
Annual rainfall42.4inInches per year, scaled to 70 in — the rows above count days
Warmest month
July
Average high 83°F
Coldest month
January
Average low 18°F
What people here do for work
Education & health care23.5%
Professional & business services13.5%
Retail trade10.5%
Manufacturing9.7%
Top four industries · share of all workers · ACS 2024
Wealthiest person in Illinois
Name
Lukas Walton
Forbes, Apr 2025
Net worth
$39B
As of 25 Apr 2025 — not live
Lives in
Chicago
Source of wealth
Walmart
Compiled from public reporting, not from an official dataset, and not independently verified.
Largest employer in Illinois · private sector
Employer
Advocate Health Care
Sector
Healthcare
Compiled from public reporting, not from an official dataset, and not independently verified. Government employers are excluded.
Largest public company in Illinois
Company
Archer Daniels Midland
Revenue
$85.5B
Fiscal year 2024
Headquarters
Chicago
Ticker
ADM
Compiled from public reporting, not from an official dataset, and not independently verified.