Washington, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Washington, Illinois is 15,946 as of the 2023 American Community Survey, making it the 158th-largest city in Illinois. The median household income is $91,360, the median home value is $216,700, and the median age is 37.3.
The population has grown 3.8% since 2010 (15,280 → 15,857).
15,946
Population
1864
People / sq mi
$91,360
Median Income
$216,700
Median Home Value
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Washington covers 8.6 sq mi of land at 1864 people per square mile.
About Washington, IL
The poverty rate is what most separates Washington from the typical city: 2.8% of residents live below the federal poverty line, against 12.4% nationally. Washington is a city in Illinois with a population of 15,946.
Household earnings are middling, with a median of $91,360 — above the US median of $78,538. Only 2.8% of residents live in poverty, below the national 12.4%. Property is affordable here, the median home worth $216,700, with typical rent around $1,087.
Educational attainment is on the higher side for US cities — 43.8% of adults hold a four-year degree, above the national 35.0%. Remote work is below the national 14.0% at 12.4%, and the average commute runs about 20 minutes each way.
Washington city Population History (2010-2024)
The city of Washington city had a population of 15,280 in 2010 and 15,857 in 2024, a 3.8% growth over 14 years. The peak was 16,672 in 2017. Average annual growth rate: 0.28%.
15,857
Population (2024)
15,280
Population (2010)
16,672
Peak (2017)
0.28%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 15,280 |
| 2011 | 15,452 |
| 2012 | 15,525 |
| 2013 | 15,742 |
| 2014 | 15,639 |
| 2015 | 16,461 |
| 2016 | 16,661 |
| 2017 | 16,672 |
| 2018 | 16,570 |
| 2019 | 16,516 |
| 2020 | 16,064 |
| 2021 | 15,991 |
| 2022 | 15,864 |
| 2023 | 15,853 |
| 2024 | 15,857 |
Race & Ethnicity
| White | 95.4% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.3% |
| Two or More Races | 0.0% |
Economy & Income
$91,360
Median Household Income
$42,060
Per Capita Income
2.8%
Poverty Rate
0.8%
Unemployment Rate
Housing
$216,700
Median Home Value
$1,087
Median Rent
80.0%
Owner-Occupied
Education
98.3%
High School+
43.8%
Bachelor's+
Commute
0.0%
Drive Alone
79.7%
Public Transit
12.4%
Work From Home
20.2 min
Avg Commute
Community Profile
15.6%
Foreign Born
97.7%
Non-English at Home
7.8%
Veterans
7.7%
With Disability
93.3%
Health Insurance
94.7%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 27.2% |
| Manufacturing | 13.7% |
| Finance, Insurance & Real Estate | 10.5% |
| Education, Health Care & Social Services | 9.0% |
| Arts, Entertainment & Food Services | 7.1% |
| Information | 6.1% |
| Construction | 4.6% |
| Public Administration | 4.1% |
| Retail Trade | 3.8% |
| Transportation & Warehousing | 1.2% |
| Agriculture & Mining | 0.9% |
Largest cities in Illinois
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Frequently Asked Questions
Washington, Illinois has a population of 15,946 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 158th-largest city in Illinois.
The median household income in Washington, Illinois is $91,360, with 2.8% of residents living below the federal poverty level.
The median home value in Washington, Illinois is $216,700, with median monthly rent at $1,087 and a homeownership rate of 80.0%.
The median age in Washington, Illinois is 37.3 years. The population is 47.1% male and 52.9% female.
The population has grown 3.8% since 2010 (15,280 → 15,857).
Washington city, IL Climate
Washington city, IL has an average annual temperature of 10.2°C (50°F) and receives about 953 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
10.2°C
Avg Temp
953
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -5° / 22° | 40 mm |
| February | -2° / 28° | 39 mm |
| March | 4° / 39° | 76 mm |
| April | 10° / 51° | 97 mm |
| May | 16° / 61° | 104 mm |
| June | 21° / 71° | 103 mm |
| July | 24° / 75° | 100 mm |
| August | 23° / 73° | 86 mm |
| September | 19° / 65° | 97 mm |
| October | 12° / 53° | 72 mm |
| November | 5° / 40° | 74 mm |
| December | -2° / 28° | 65 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Washington city, IL
The most comfortable months to visit Washington city, IL are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -10°C low). May is usually the wettest month.
Where to stay near Washington
Visiting or relocating to Washington, IL? Compare hotels and short-term rentals across the metro — live availability and prices.
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Population, race, income, age, and trends across Illinois
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.