About Rock Island County
Rock Island County is a city located in United States, in the Illinois region. According to the latest available data (2026), the population of Rock Island County is approximately 144,672 residents, making it the #569 most populous city in United States.
Globally, Rock Island County ranks #11,615 among the world's most populated cities.
Rock Island County City Statistics
| City | Rock Island County |
| Country |  United States |
| Population | 144,672 |
| Global Rank | #11,615 |
| Rank in United States | #569 of 867 cities |
| City Category | city |
| Region | Illinois |
| Latitude | 41.47 |
| Longitude | -90.57 |
| Data Year | 2026 |
Where is Rock Island County Located?
Rock Island County is located in United States, in the Illinois region, at coordinates 41.47° latitude and -90.57° longitude. Located in the mid-latitudes, Rock Island County experiences distinct four-season weather patterns.
Nearby Cities
Other Cities in United States
Largest Cities in United States
| # | City | Population |
|---|---|---|
| 1 | Harris County | 4,731,145 |
| 2 | Los Angeles | 3,898,747 |
| 3 | San Diego County | 3,298,634 |
| 4 | Brooklyn | 2,736,074 |
| 5 | Miami-Dade County | 2,701,767 |
Frequently Asked Questions
What is the population of Rock Island County?
The population of Rock Island County is approximately 144,672 residents according to the latest available data (2026).
Where is Rock Island County located?
Rock Island County is located in United States at approximately 41.47° latitude and -90.57° longitude.
Is Rock Island County one of the largest cities in United States?
With a population of 144,672, Rock Island County is one of the notable urban areas in United States. It ranks #569 out of 867 cities in the country.
