States › Illinois

State

Illinois

102 counties or equivalents, 1,412 places and 1,378 ZIP Codes with PLACES estimates; 12,549,689 residents.

Counties
Largest places
State figures are site aggregates: population-weighted county estimates, no interval

Illinois within the United States. Boundaries: US Census Bureau.

These are model-based estimates, not measurements. CDC PLACES applies a statistical model to national survey responses and Census population data to estimate what share of an area's adults report each condition or behaviour. CDC: "We do not produce estimates for individuals; only aggregated results for counties, places, census tracts, or ZCTAs."

CDC on comparisons: "It is not adequate to simply compare point estimates. The confidence intervals should also be considered, and some are very broad." This site says higher or lower only when two 95% confidence intervals do not overlap, and similar when they do. CDC also advises that the data "should not be used for ranking the overall health of any county, place, census tract, or ZCTA" and that the model "cannot detect effects due to local interventions".

Source: CDC PLACES 2025 release, data updated 4 Dec 2025. What PLACES is · Reading the intervals · Methodology. Not medical advice.

34.0%obesity, adults (site aggregate)counties 29.2%–45.6%above US interval 32.4–33.1

11.7%diabetes, adults (site aggregate)counties 9.4%–19.0%below US interval 11.8–12.2

33.0%high blood pressure, adults (site aggregate)counties 28.7%–47.9%below US interval 34.0–34.7

18.6%fair or poor health, adults (site aggregate)counties 14.2%–28.8%below US interval 18.9–19.5

Illinois has 102 counties or equivalents, 1,412 places and 1,378 ZIP Code Tabulation Areas with PLACES estimates, covering 12,549,689 residents (9,844,167 adults).

PLACES does not publish state totals. The state figures here are population-weighted county estimates computed by this site, following CDC's published method for aggregating areas, and carry no interval. For the 2025 release that gives obesity at 34.0% (site aggregate) (age-adjusted 34.1%), above the national interval around 32.8%; county estimates range from 29.2% to 45.6%.

Diagnosed diabetes is 11.7% (site aggregate) by the same method (national 12.0%) and 9.9% (site aggregate) of adults aged 18–64 are estimated to lack health insurance (national 11.0%).

Report card: 40 measures by CDC category

Crude prevalence is the estimated share of all adults. Age-adjusted prevalence is standardised to the 2000 US standard population so that areas with different age structures can be compared. CDC: "Age-adjusted estimates are only available at the county and place-level."

estimate with 95% intervalUS estimate

Health outcomes (12)vs the US interval: 1 above · 8 below · 3 within

MeasureEstimate and 95% intervalValueFlagsRelease

All teeth lost among adults aged ≥65 yearsBRFSS 2022 · Adults aged 65 years and older10.3%10.6%US ↓US ↓2025

Arthritis among adultsBRFSS 202324.2%21.3%US ↓US ↓2025

Cancer (non-skin) or melanoma among adultsBRFSS 20237.6%6.4%US ↓US ≈2025

Chronic obstructive pulmonary disease among adultsBRFSS 20236.3%5.6%US ≈US ↑2025

Coronary heart disease among adultsBRFSS 20235.9%4.9%US ↓US ↓2025

Current asthma among adultsBRFSS 20239.9%9.9%US ≈US ≈2025

Depression among adultsBRFSS 202319.8%20.3%US ↓US ↓2025

Diagnosed diabetes among adultsBRFSS 202311.7%10.2%US ↓US ≈2025

High blood pressure among adultsBRFSS 202333.0%29.9%US ↓US ↓2025

High cholesterol among adults who have ever been screenedBRFSS 202335.4%31.3%US ↓US ↓2025

Obesity among adultsBRFSS 202334.0%34.1%US ↑US ↑2025

Stroke among adultsBRFSS 20233.3%2.8%US ≈US ≈2025

Prevention (7)vs the US interval: 0 above · 5 below · 2 within

MeasureEstimate and 95% intervalValueFlagsRelease

Cholesterol screening among adultsBRFSS 202387.4%86.2%US ≈US ↑2025

Colorectal cancer screening among adults aged 45–75 yearsBRFSS 2022 · Adults aged 45–75 years60.2%55.4%US ↓US ↑2025

Current lack of health insurance among adults aged 18-64 yearsBRFSS 2023 · Adults aged 18–64 years9.9%10.2%US ↓US ↓2025

Mammography use among women aged 50-74 yearsBRFSS 2022 · Women aged 50–74 years73.5%73.0%US ↓US ↓2025

Taking medicine to control high blood pressure among adults with high blood pressureBRFSS 202375.7%56.7%US ↓US ↓2025

Visited dentist or dental clinic in the past year among adultsBRFSS 202263.4%63.0%US ↓US ↓2025

Visits to doctor for routine checkup within the past year among adultsBRFSS 202377.8%76.1%US ≈US ↑2025

Health risk behaviors (4)vs the US interval: 2 above · 2 below · 0 within

MeasureEstimate and 95% intervalValueFlagsRelease

Binge drinking among adultsBRFSS 202317.8%19.1%US ↑US ↑2025

Current cigarette smoking among adultsBRFSS 202312.1%12.3%US ↑US ↑2025

No leisure-time physical activity among adultsBRFSS 202323.0%22.3%US ↓US ↓2025

Short sleep duration among adultsBRFSS 202235.4%36.2%US ↓US ↓2025

Disability (7)vs the US interval: 0 above · 7 below · 0 within

MeasureEstimate and 95% intervalValueFlagsRelease

Any disability among adultsBRFSS 202327.6%26.4%US ↓US ↓2025

Cognitive disability among adultsBRFSS 202312.6%13.0%US ↓US ↓2025

Hearing disability among adultsBRFSS 20236.2%5.4%US ↓US ↓2025

Independent living disability among adultsBRFSS 20237.6%7.5%US ↓US ≈2025

Mobility disability among adultsBRFSS 202312.8%11.3%US ↓US ↓2025

Self-care disability among adultsBRFSS 20233.5%3.3%US ↓US ≈2025

Vision disability among adultsBRFSS 20234.8%4.6%US ↓US ↓2025

Health status (3)vs the US interval: 0 above · 2 below · 1 within

MeasureEstimate and 95% intervalValueFlagsRelease

Fair or poor self-rated health status among adultsBRFSS 202318.6%17.9%US ↓US ↓2025

Frequent mental distress among adultsBRFSS 202315.6%16.3%US ≈US ≈2025

Frequent physical distress among adultsBRFSS 202312.2%11.6%US ↓US ↓2025

Health-related social needs (7)vs the US interval: 7 above · 0 below · 0 within

MeasureEstimate and 95% intervalValueFlagsRelease

Food insecurity in the past 12 months among adultsBRFSS 202315.9%16.5%US ↑US ↑2025

Housing insecurity in the past 12 months among adultsBRFSS 202313.2%14.0%US ↑US ↑2025

Lack of reliable transportation in the past 12 months among adultsBRFSS 20238.0%8.4%US ↑US ≈2025

Lack of social and emotional support among adultsBRFSS 202325.4%26.0%US ↑US ↑2025

Loneliness among adultsBRFSS 202333.5%34.3%US ↑US ↑2025

Received food stamps in the past 12 months among adultsBRFSS 202313.8%14.4%US ↑US ↑2025

Utility services shut-off threat in the past 12 months among adultsBRFSS 20237.8%8.3%US ↑US ≈2025

State figures are population-weighted county estimates computed by this site and carry no interval, so the dot is a point and the US flag says whether the state figure falls above, below or within CDC's national 95% interval. Each measure links to its national and state tables.

Counties in Illinois

Order counties bycrude prevalence, highest point estimate first

Ordered by point estimate; intervals overlap for most neighbouring rows, so the order is not a ranking. The flag says whether each row's interval lies above, below or in line with the Illinois figure, which is a population-weighted county estimate computed by this site and carries no interval.

Counties	Population	Estimate	95% interval	vs the Illinois figure
Pulaski County	4,911	45.6%	36.5–55.1	above
Alexander County	4,695	45.3%	36.0–55.1	above
Vermilion County	71,652	43.8%	35.6–52.3	above
Macon County	100,591	42.1%	33.6–50.6	in line
Winnebago County	280,922	42.0%	35.0–49.7	above
Franklin County	37,138	41.6%	32.6–51.1	in line
Brown County	6,294	41.5%	36.9–46.1	above
Clay County	12,999	41.5%	32.6–51.0	in line
Johnson County	13,326	41.4%	32.5–50.5	in line
Ogle County	51,265	40.9%	33.0–50.2	in line
Gallatin County	4,670	40.8%	31.7–50.1	in line
Massac County	13,661	40.8%	32.2–50.3	in line
Lawrence County	14,813	40.7%	32.3–50.0	in line
Perry County	20,503	40.7%	36.1–45.3	above
Cass County	12,596	40.6%	32.0–49.8	in line
Iroquois County	26,136	40.6%	32.2–49.9	in line
Pike County	14,342	40.6%	31.9–49.6	in line
Stephenson County	43,105	40.6%	31.8–49.5	in line
Schuyler County	6,733	40.4%	31.5–49.6	in line
Edwards County	5,968	40.3%	30.4–50.1	in line
Saline County	22,873	40.3%	31.1–49.8	in line
Clinton County	36,785	40.2%	31.7–49.1	in line
Greene County	11,543	40.2%	31.5–49.3	in line
Crawford County	18,300	40.1%	31.9–49.0	in line
Williamson County	66,706	40.1%	32.0–49.0	in line
Hamilton County	7,911	40.0%	31.0–49.5	in line
Fulton County	32,541	39.9%	31.5–48.7	in line
Morgan County	32,140	39.9%	31.0–49.0	in line
Wayne County	15,761	39.9%	31.1–49.6	in line
Fayette County	21,164	39.8%	31.2–48.8	in line
Jackson County	52,141	39.8%	31.6–48.4	in line
Jefferson County	36,320	39.8%	31.1–49.2	in line
Kankakee County	105,940	39.8%	31.8–48.1	in line
Union County	16,667	39.8%	30.5–49.2	in line
Wabash County	10,942	39.8%	31.4–49.0	in line
Hardin County	3,569	39.7%	30.9–49.2	in line
Kendall County	139,976	39.7%	32.0–47.6	in line
Pope County	3,707	39.6%	30.4–48.9	in line
Rock Island County	141,236	39.6%	31.9–47.6	in line
Sangamon County	193,491	39.6%	31.8–47.6	in line
Marion County	36,673	39.5%	30.5–48.9	in line
Richland County	15,488	39.4%	30.5–49.1	in line
Knox County	48,411	39.2%	30.8–47.7	in line
White County	13,401	39.2%	30.9–49.2	in line
Montgomery County	27,663	39.1%	30.6–48.7	in line
Bond County	16,450	39.0%	30.5–48.3	in line
Jersey County	21,091	39.0%	30.2–48.5	in line
Lee County	33,654	38.9%	30.4–47.9	in line
Carroll County	15,526	38.8%	30.0–48.1	in line
Hancock County	17,186	38.8%	30.2–47.6	in line
Randolph County	29,815	38.8%	30.4–47.4	in line
St. Clair County	251,018	38.8%	31.7–46.5	in line
Cumberland County	10,261	38.7%	30.0–48.1	in line
Madison County	262,752	38.7%	32.1–46.0	in line
Henderson County	6,088	38.6%	29.8–47.6	in line
Marshall County	11,683	38.6%	29.5–47.5	in line
Mercer County	15,487	38.6%	30.1–47.6	in line
Douglas County	19,629	38.5%	30.1–47.5	in line
Logan County	27,590	38.5%	29.6–47.6	in line
Moultrie County	14,342	38.4%	29.6–47.7	in line
Scott County	4,710	38.4%	29.7–47.3	in line
De Witt County	15,365	38.2%	29.6–47.2	in line
Jasper County	9,144	38.2%	29.7–47.2	in line
Stark County	5,218	38.2%	29.5–47.4	in line
Bureau County	32,729	38.1%	29.8–47.0	in line
Christian County	33,228	38.1%	29.6–47.0	in line
Will County	700,728	38.0%	32.4–43.8	in line
Menard County	11,954	37.9%	29.2–47.5	in line
Adams County	64,441	37.8%	29.2–46.7	in line
LaSalle County	108,309	37.8%	29.8–46.6	in line
Coles County	46,060	37.7%	29.5–46.2	in line
Ford County	13,250	37.7%	29.1–46.7	in line
Shelby County	20,568	37.6%	29.8–47.7	in line
Edgar County	16,334	37.5%	28.6–46.1	in line
Clark County	15,088	37.3%	28.8–46.3	in line
Mason County	12,523	37.3%	28.7–46.5	in line
Woodford County	38,285	37.3%	28.8–46.0	in line
Macoupin County	44,018	37.0%	28.6–45.5	in line
Warren County	16,185	37.0%	28.5–46.1	in line
Henry County	48,448	36.9%	28.4–45.8	in line
Boone County	53,202	36.8%	28.7–45.7	in line
Washington County	13,536	36.8%	27.9–45.7	in line
Grundy County	53,578	36.4%	28.2–45.0	in line
McDonough County	26,839	36.3%	28.1–45.2	in line
Tazewell County	129,541	36.3%	28.6–44.5	in line
Whiteside County	54,498	36.2%	28.1–45.2	in line
Jo Daviess County	21,756	36.1%	28.1–45.0	in line
Putnam County	5,561	36.1%	27.2–45.5	in line
Livingston County	35,320	35.9%	27.6–44.7	in line
Monroe County	34,957	35.5%	27.2–44.3	in line
Calhoun County	4,317	35.3%	26.5–44.5	in line
DeKalb County	100,288	35.1%	27.7–43.2	in line
Kane County	514,982	35.1%	29.2–41.2	in line
Piatt County	16,714	35.1%	26.8–44.3	in line
Peoria County	177,513	34.8%	27.7–42.3	in line
McLean County	170,441	34.5%	27.3–41.7	in line
Effingham County	34,331	34.3%	26.5–42.6	in line
Lake County	708,760	32.9%	27.3–38.7	in line
McHenry County	312,800	32.1%	25.8–38.7	in line
Champaign County	205,644	31.1%	24.6–38.1	in line
Cook County	5,087,072	31.0%	27.7–34.6	in line
DuPage County	921,213	29.2%	24.5–34.5	in line

Largest places in Illinois

Chicago 2,746,388
Aurora 180,542
Joliet 150,362
Naperville 149,540
Rockford 148,655
Elgin 114,797
Springfield 114,394
Peoria 113,150
Waukegan 89,321
Champaign 88,302
Cicero 85,268
Schaumburg 78,723
Bloomington 78,680
Evanston 78,110
Arlington Heights 77,676
Bolingbrook 73,922
Decatur 70,522
Palatine 67,908
Skokie 67,824
Des Plaines 60,675
Orland Park 58,703
Oak Lawn 58,362
Berwyn 57,250
Mount Prospect 56,852
Tinley Park 55,971

The 25 most populous places; every county page lists all of its places and ZIP Codes.

Measures

State figures are population-weighted county estimates computed by this site and carry no interval; the word says whether each falls above, below or within CDC's national interval.

Health outcomes

All Teeth Lost 10.3% (site aggregate) · US 12.2% · below US interval
Arthritis 24.2% (site aggregate) · US 25.4% · below US interval
Cancer (non-skin) or Melanoma 7.6% (site aggregate) · US 7.9% · below US interval
COPD 6.3% (site aggregate) · US 6.2% · within US interval
Coronary Heart Disease 5.9% (site aggregate) · US 6.4% · below US interval
Current Asthma 9.9% (site aggregate) · US 9.8% · within US interval
Depression 19.8% (site aggregate) · US 20.2% · below US interval
Diabetes 11.7% (site aggregate) · US 12.0% · below US interval
High Blood Pressure 33.0% (site aggregate) · US 34.4% · below US interval
High Cholesterol 35.4% (site aggregate) · US 37.4% · below US interval
Obesity 34.0% (site aggregate) · US 32.8% · above US interval
Stroke 3.3% (site aggregate) · US 3.4% · within US interval

Prevention

Cholesterol Screening 87.4% (site aggregate) · US 87.5% · within US interval
Colorectal Cancer Screening 60.2% (site aggregate) · US 66.3% · below US interval
Health Insurance 9.9% (site aggregate) · US 11.0% · below US interval
Mammography 73.5% (site aggregate) · US 76.5% · below US interval
High Blood Pressure Medication 75.7% (site aggregate) · US 77.0% · below US interval
Dental Visit 63.4% (site aggregate) · US 63.9% · below US interval
Annual Checkup 77.8% (site aggregate) · US 77.7% · within US interval

Health risk behaviors

Binge Drinking 17.8% (site aggregate) · US 15.2% · above US interval
Current Cigarette Smoking 12.1% (site aggregate) · US 11.4% · above US interval
Physical Inactivity 23.0% (site aggregate) · US 24.5% · below US interval
Short Sleep Duration 35.4% (site aggregate) · US 36.0% · below US interval

Disability

Any Disability 27.6% (site aggregate) · US 30.0% · below US interval
Cognitive Disability 12.6% (site aggregate) · US 13.7% · below US interval
Hearing Disability 6.2% (site aggregate) · US 6.7% · below US interval
Independent Living Disability 7.6% (site aggregate) · US 7.9% · below US interval
Mobility Disability 12.8% (site aggregate) · US 13.5% · below US interval
Self-care Disability 3.5% (site aggregate) · US 3.8% · below US interval
Vision Disability 4.8% (site aggregate) · US 5.5% · below US interval

Health status

General Health 18.6% (site aggregate) · US 19.2% · below US interval
Frequent Mental Distress 15.6% (site aggregate) · US 15.6% · within US interval
Frequent Physical Distress 12.2% (site aggregate) · US 12.8% · below US interval

Health-related social needs

Food Insecurity 15.9% (site aggregate) · US 14.7% · above US interval
Housing Insecurity 13.2% (site aggregate) · US 11.7% · above US interval
Transportation Barriers 8.0% (site aggregate) · US 7.7% · above US interval
Lack of Social/Emotional Support 25.4% (site aggregate) · US 23.3% · above US interval
Loneliness 33.5% (site aggregate) · US 32.0% · above US interval
Food Stamps 13.8% (site aggregate) · US 11.2% · above US interval
Utility Services Threat 7.8% (site aggregate) · US 7.4% · above US interval

Questions and answers

How is the Illinois figure calculated?

PLACES publishes county, place, tract and ZCTA estimates but no state row. Following CDC's guidance for aggregating areas, this site multiplies each county's estimate by its adult population, sums across the state's 102 counties and divides by the total adult population. The result has no published confidence interval, so county pages describe their position against it as above, below or in line with the state figure.

Which Illinois counties have the highest obesity estimates?

The county table on this page can be sorted by any of the 40 measures. Estimates are listed with their 95% confidence intervals; adjacent counties often have overlapping intervals and cannot be told apart, so the order is by point estimate only and is not a ranking of health.

What is the difference between crude and age-adjusted figures?

Crude prevalence is the estimated share of all adults. Age-adjusted prevalence re-weights the estimate to the 2000 US standard population so areas with different age structures can be compared; CDC publishes age-adjusted figures for counties and places only. The toggle on this page switches between them.

Where does this data come from?

CDC PLACES: Local Data for Better Health, 2025 release, data updated 4 Dec 2025; the state figure for obesity is 34.0% (site aggregate) in the 2025 release.

Provenance

Source: Centers for Disease Control and Prevention, PLACES: Local Data for Better Health, 2025 release (data updated 4 Dec 2025), with the 2022, 2023, 2024 releases for reference; US government work, public domain. Boundaries and ZIP-to-county relationships: US Census Bureau. Percentages are shown to one decimal as CDC publishes them; state figures are population-weighted means computed by this site. The Illinois figure for each measure is the sum over counties of estimate × adult population, divided by the state's adult population, per CDC's guidance for aggregating areas; measures defined on a subgroup (women 50–74, adults 18–64, adults 65 and over) are weighted by total adult population as an approximation. Processing errors are corrected at the next daily build; see corrections. Generated 30 Sep 2026.