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McHenry County, Illinois

Moderate risk

Gera County Health Risk Index: 36.2/100 · National rank 344 of 480 · Population: 312,800 · CDC PLACES June 2026

What is the chronic-disease health risk in McHenry County, Illinois?

As of June 2026, McHenry County, Illinois has a Gera County Health Risk Index of 36.2/100 (national rank 344/480; moderate risk). Adult chronic-disease prevalence: obesity 32.1%, diabetes 10.5%, coronary heart disease 5.6%, smoking 11.5%. Source: CDC PLACES June 2026.

Source:CDC PLACES: Local Data for Better Health, County Data 2023 release·as of June 2026updated annually (last: )
Gera County Health Risk Index36.2 / 100Rank 344 of 480 most-populous US counties. Computed from CDC PLACES June 2026 crude prevalence for 4 chronic-disease measures, weighted and normalised 0–100. Higher = higher risk.How this index is calculated

Chronic-disease prevalence — McHenry County (CDC PLACES June 2026)

McHenry County, Illinois — CDC PLACES June 2026 crude prevalence (adults)
MeasurePrevalenceWeight in GCHRI
Obesity32.1%25%
Diagnosed diabetes10.5%25%
Coronary heart disease5.6%30%
Current cigarette smoking11.5%20%
GCHRI composite score36.2 / 100—

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Search any of the 480 most-populous US counties to compare GCHRI scores and CDC prevalence rates.

McHenry County, Illinois

Population: 312,800 · National rank: 344 / 480 (by chronic-disease risk)

Moderate risk

Gera County Health Risk Index

36.2 / 100

Obesity

32.1%

adults

Diabetes

10.5%

adults

Heart Disease

5.6%

adults

Smoking

11.5%

adults

Source: CDC PLACES, June 2026 · Crude prevalence, adults · Full county page →

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Frequently asked questions

What is the Gera County Health Risk Index for McHenry County, IL?
McHenry County, IL has a Gera County Health Risk Index (GCHRI) of 36.2/100, ranking 344 out of 480 most-populous US counties (rank 1 = highest chronic-disease risk). This places it in the moderate-risk tier. Source: CDC PLACES (June 2026).
What is the obesity rate in McHenry County?
The adult obesity prevalence in McHenry County, IL is 32.1% (CDC PLACES, June 2026, crude prevalence). The national mean across the 480 included counties is 32.1%.
What is the diabetes rate in McHenry County?
The diagnosed diabetes prevalence among adults in McHenry County, IL is 10.5% (CDC PLACES, June 2026, crude prevalence).
What is the coronary heart disease rate in McHenry County?
The coronary heart disease prevalence among adults in McHenry County, IL is 5.6% (CDC PLACES, June 2026, crude prevalence).
What is the smoking rate in McHenry County?
The current cigarette smoking prevalence among adults in McHenry County, IL is 11.5% (CDC PLACES, June 2026, crude prevalence).

Concerned about health risks in McHenry County?

A GeraClinic care navigator can help you understand what these CDC chronic-disease rates mean for you personally, assess your individual risk factors, and connect you with preventive-care resources — fully online.

Talk to a GeraClinic care navigatorHow the Gera County Health Risk Index is calculated

Contains public sector information published by U.S. Centers for Disease Control and Prevention (CDC) and licensed under the U.S. Public Domain (federal government work, 17 U.S.C. § 105). Source: CDC PLACES: Local Data for Better Health, County Data 2023 release (June 2026, published 2023 (released 2024)).

Informational/educational only — not a substitute for professional medical advice; a clinician interprets results.