Illinois's 16th congressional district
Interactive map of district boundaries since January 3, 2023
Representative	Darin LaHood R–Peoria
Area	9,030.5 mi2 (23,389 km2)
Distribution	71% urban 29% rural
Population (2024)	752,764
Median household income	$85,435[1]
Ethnicity	84.8% White 6.6% Hispanic 3.7% Two or more races 2.3% Asian 2.2% Black 0.4% other
Cook PVI	R+11[2]

The 16th congressional district of Illinois is represented by Republican Darin LaHood. Prominent past representatives from the 16th district have included Everett Dirksen, who went on to become the Republican leader in the United States Senate; John B. Anderson, who became the 3rd highest ranking Republican in the House and went on to run as a major independent candidate in the 1980 United States presidential election; and Lynn Martin, who later served as United States Secretary of Labor.

For more than six decades, the shape of the 16th district fluctuated far less than that of any other Illinois congressional district. At this time, it generally included the northwest corner of the state, extending just far enough to the east to grab its largest city, Rockford.^[3] By the 1990s, it also extended eastward to include part of McHenry County, an outer suburb of Chicago. This geographic stability also contributed to electoral stability. It first became a Rockford-based district for the 1948 election, and from then until 2012, it was represented by just five people, all but one of whom was a Republican. The sole Democrat to have held it in that period, John W. Cox, Jr., only did so for one term.

For the 118th and successive Congresses (based on redistricting following the 2020 census), the district contains all or portions of the following counties, townships, and municipalities:^[5]

Boone County (12)

Belvidere (part, also 11th), Belvidere Township (part, also 11th), Boone Township, Caledonia, Caledonia Township, Capron, Flora Township (part, also 11th), Leroy Township, Manchester Township, Poplar Grove (part, also 11th), Poplar Grove Township, Timberlane

Bureau County (32)

Arispie Township, Buda, Bureau Township, Clarion Township, Concord Township, Dover, Dover Township, Fairfield Township, Gold Township, Greenville Township, Indiantown Township, La Moille, La Moille Township, Leepertown Township (part, also 14th), Macon Township, Manlius, Manlius Township, Mineral, Mineral Township, Neponset, Neponset Township, New Bedford, Ohio, Ohio Township, Princeton, Princeton Township, Sheffield, Tiskilwa, Walnut, Walnut Township, Wyanet, Wyanet Township

DeKalb County (4)

Franklin Township, Kirkland, Mayfield Township, South Grove Township

Ford County (2)

Drummer Township (part, also 2nd), Gibson City

Grundy County (34)

All 34 townships and municipalities

Henry County (31)

Alba Township, Alpha, Annawan (part, shared with Bureau County), Annawan Township, Andover, Andover Township, Atkinson, Atkinston Township, Bishop Hill, Burns Township, Cambridge, Cambridge Township, Cleveland, Clover Township, Colona Township (part, also 17th), Cornwall Township, Edford Township, Geneseo, Geneseo Township, Hooppole, Loraine Township, Lynn Township, Munson Township, Osco Township, Orion, Oxford Township, Phenix Township, Weller Township, Western Township, Woodhull, Yorktown Township

Jo Daviess County (33)

All 33 townships and municipalities

LaSalle County (22)

Allen Township, Brookfield Township, Bruce Township, Deer Park Township (part, also 14th), Eagle Township, Eden Township (part, also 14th), Fall River Township, Farm Ridge Township (part, also 14th), Grand Rapids Township, Grand Ridge, Hope Township, Kangley, Leonore, Lostant, Marseilles, Otter Creek Township, Ransom, Richland Township, Seneca (part, also 14th; shared with Grundy County), Streator (part, shared with Livingston County), Tonica (part, also 14th), Vermillion Township

Lee County (34)

All 34 townships and municipalities

Livingston County (17)

Amity Township, Cornell, Eppards Point Township, Esmen Township, Flanagan, Long Point, Long Point Township, Nebraska Township, Newtown Township, Pike Township, Pontiac (part, also 2nd), Pontiac Township (part, also 2nd), Reading Township, Rooks Creek Township, Streator (part, shared with LaSalle County), Sunbury Township, Waldo Township

Marshall County (21)

All 21 townships and municipalities

McHenry County (6)

Alden, Alden Township, Chemung Township, Dunham Township, Hartland Township (part, also 11th), Harvard

McLean County (48)

Allin Township, Anchor, Anchor Township, Arrowsmith, Arrowsmith Township, Bellflower, Bellflower Township, Bloomington (part, also 17th), Bloomington Township, Blue Mound Township, Carlock, Cheney's Grove Township, Chenoa, Chenoa Township, Colfax, Cooksville, Cropsey Township, Dale Township (part, also 17th; includes part of Twin Grove), Danvers, Danvers Township, Dawson Township, Downs, Downs Township, Dry Grove Township (part, also 17th; includes part of Twin Grove), Ellsworth, Empire Township, Gridley, Gridley Township, Heyworth, Hudson, Hudson Township, Lawndale Township, Le Roy, Lexington, Lexington Township, Martin Township, Money Creek Township, Normal (part, also 17th), Normal Township (part, also 17th), Old Town Township, Randolph Township, Saybrook, Stanford, Towanda, Towanda Township, West Township, White Oak Township, Yates Township

Ogle County (37)

All 37 townships and municipalities

Peoria County (19)

Akron Township, Bellevue (part, also 17th), Brimfield, Brimfield Township, Chillicothe, Chillicothe Township, Dunlap, Hallock Township, Jubilee Township, Kickapoo Township, Limestone Township (part, also 17th), Medina Township, Millbrook Township, Norwood, Peoria (part, also 17th), Princeville, Princeville Township, Radnor Township, West Peoria (part, also 17th)

Putnam County (5)

Hennepin Township (part, also 14th), Magnolia, Magnolia Township, McNabb, Senachwine Township

Stark County (12)

All 12 townships and municipalities

Stephenson County (15)

Buckeye Township, Cedarville (part, also 17th), Dakota, Dakota Township, Davis, Lena, Oneco Township, Orangeville, Rock City, Rock Grove Township, Rock Run Township, Waddams Township, West Point Township, Winslow, Winslow Township

Tazewell County (24)

Cincinnati Township (part, also 17th), Creve Coeur, Deer Creek (part, shared with Woodford County), Deer Creek Township, East Peoria, Elm Grove Township, Fondulac Township, Groveland Township, Hopedale, Hopedale Township (part, also 17th), Little Mackinaw Township (part, also 17th), Mackinaw, Mackinaw Township, Marquette Heights, Minier, Morton, Morton Township, North Pekin, Pekin (part, also 17th), Pekin Township (part, also 17th), Tremont, , ,

Woodford County (17)

All 17 townships and municipalities

• Illinois's congressional districts
• List of United States congressional districts

• Martis, Kenneth C. (1989). The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982). The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present

• Washington Post page on the 16th District of Illinois
• U.S. Census Bureau - 16th District Fact Sheet Archived July 17, 2011, at the Wayback Machine