Whiteside County, Illinois
Whiteside County, Illinois, has 54,121 residents (July 2025 estimate). Its county seat is Morrison. It uses Central Time and covers 684 sq mi (1,772 km²) of land.
- Resident population, July 2025
- 54,121
- Land area
- 684 sq mi (1,772 km²)
- County seat or government
- Morrison
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $67,500 ± $2,936
- Median home value
- $127,100 ± $6,398
- Median rent, with utilities
- $856 ± $37
- Homes lived in by their owners
- 76.9% ± 1.4 points
- County type
- County
- Metro or micro area
- Sterling, IL micro areaCentral county
- Water area
- 12.3 sq mi (31.9 km²)
- State
- Illinois
- County code (FIPS)
- 17195
- Coordinates (central point)
- 41.750675, -89.911005
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Whiteside County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 6108120,844 people
- 6107113,581 people
- 6125412,135 people
- 612706,912 people
- 612525,437 people
- 610643,757 people
- 612773,054 people
- 612502,781 people
- 612831,269 people
- 610141,067 people
- 612301,039 people
- 61261656 people
15 ZIP Code areas overlap Whiteside County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Whiteside County, largest first
- Sterling Township17,089 people
- Coloma Township10,446 people
- Mount Pleasant Township4,720 people
- Fulton Township4,303 people
- Montmorency Township2,539 people
- Prophetstown Township2,527 people
- Hopkins Township2,148 people
- Erie Township1,930 people
- Union Grove Township1,419 people
- Garden Plain Township1,161 people
- Tampico Township859 people
- Jordan Township838 people
All 22
- Albany Township823 people
- Lyndon Township656 people
- Genesee Township615 people
- Fenton Township600 people
- Hume Township574 people
- Newton Township489 people
- Ustick Township410 people
- Portland Township404 people
- Clyde Township258 people
- Hahnaman Township139 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county
School districts in Whiteside County, largest first
- Sterling Community Unit District 520,900 people
- Rock Falls Township High School District 30113,773 people
- Rock Falls Elementary School District 137,973 people
- Morrison Community Unit School District 66,603 people
- River Bend Community Unit District 26,485 people
- Bureau Valley Community Unit School District 3406,062 people
- Prophetstown-Lyndon-Tampico Community Unit School District 34,500 people
- Polo Community Unit School District 2224,118 people
- Erie Community Unit School District 13,549 people
- East Coloma-Nelson Consolidated Elementary School District 202,948 people
- Montmorency Community Consolidated School District 1452,852 people
- Chadwick-Milledgeville Community Unit School District 3992,750 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Sterling, Illinois (city)14,717 people
- Rock Falls, Illinois (city)8,587 people
- Morrison, Illinois (city)3,739 people
- Fulton, Illinois (city)3,709 people
- Prophetstown, Illinois (city)1,903 people
- Erie, Illinois (village)1,614 people
- Albany, Illinois (village)776 people
- Tampico, Illinois (village)565 people
- Como, Illinois (CDP)535 people
- Lyndon, Illinois (village)433 people
- Galt, Illinois (CDP)213 people
- Coleta, Illinois (village)169 people
All 13
- Deer Grove, Illinois (village)36 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Carroll County, Illinois22 mi north
- Henry County, Illinois30 mi south
- Bureau County, Illinois31 mi southeast
- Lee County, Illinois32 mi east
- Clinton County, Iowa34 mi west
- Ogle County, Illinois36 mi northeast
- Rock Island County, Illinois39 mi southwest
Before using this answer on a form
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