About Cook County
Cook County is a major metropolitan area located in United States, in the Illinois region. According to the latest available data (2026), the population of Cook County is approximately 5,275,541 residents, making it the third largest city in United States.
Globally, Cook County ranks #173 among the world's most populated cities. With over 5 million residents, Cook County is considered a major metropolitan hub in the region.
Cook County City Statistics
| City | Cook County |
| Country |  United States |
| Population | 5,275,541 |
| Global Rank | #173 |
| Rank in United States | #3 of 867 cities |
| City Category | major metropolitan area |
| Region | Illinois |
| Latitude | 41.8 |
| Longitude | -87.7167 |
| Data Year | 2026 |
Population Comparison
To put Cook County's population of 5,275,541 into perspective:
- Cook County's population is comparable to that of small European countries like Norway or Ireland.
- The city has more than 5 million inhabitants, making it a significant urban center globally.
- It ranks #3 among all cities in United States.
Where is Cook County Located?
Cook County is located in United States, in the Illinois region, at coordinates 41.8° latitude and -87.7167° longitude. Located in the mid-latitudes, Cook County experiences distinct four-season weather patterns.
Nearby Cities
Other Cities in United States
Largest Cities in United States
| # | City | Population |
|---|---|---|
| 1 | Travis County | 1,290,188 |
| 2 | Hennepin County | 1,281,565 |
| 3 | Oakland County | 1,274,395 |
| 4 | Cuyahoga County | 1,264,817 |
| 5 | Allegheny County | 1,250,578 |
Frequently Asked Questions
What is the population of Cook County?
The population of Cook County is approximately 5,275,541 residents according to the latest available data (2026).
Where is Cook County located?
Cook County is located in United States at approximately 41.8° latitude and -87.7167° longitude.
Is Cook County one of the largest cities in United States?
With a population of 5,275,541, Cook County is one of the major urban areas in United States. It ranks #3 out of 867 cities in the country.
