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Summary for Rock Island

About Rock Island (Click for our profile page)

Located in: Rock Island County (see below)

Typical Abbreviation: Rock Is.

Time Zone: Rock Island lies in the Central Time Zone (CST/CDT)

Telephone Area Codes: 309 & 861<1>

ZIP Codes: 61201, 61204, 61299<2>

Elevation: 600 feet [182.88 m] above sea level<3>

From the 2010 US Census (For more detail, see our Census Page for Rock Island)

Population

Year	Population
2019 Est:<4>	37,152 (4.78% decrease since 2010)
2010:	39,018 (1.68% decrease since 2000)
2000:	39,684

Total Area:<5> 17.87 sq. miles [46.3 km²] - of which 5.72% is water (1.02 sq. miles [2.6 km²])

Housing Units:<6> 17,422

GPS Coordinates (Latitude/Longitude)<7>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Rock Island:

Lat: 41.493800° (or 41°29'37" N)

Lon: -90.572800° (or -90°34'22" W)

USGS Topo Map: Milan<8>

Federal GNIS/FIPS Codes for Rock Island

GNIS ID: 2396400

FIPS State / Place Code: 17 / 65078

(For more about Federal Codes, see our Misc Page for Rock Island)

About Rock Island County

The city of Rock Island is the County Seat for Rock Island County.

From the 2010 US Census (For more detail, see our Census Page for Rock Island)

Population

Year	Population
2019 Est:	141,879 (3.88% decrease since 2010)
2010	147,610 (1.18% decrease since 2000)
2000:	149,374

Total Area: 451.3 sq. miles [1,168.8 km²] - of which 5.24% is water (23.65 sq. miles [61.3 km²])

Housing Units: 65,756

Official Website: https://rockislandcountyil.gov/

Federal GNIS/FIPS Codes for Rock Island

GNIS ID: 424282

FIPS State / County Code: 17 / 161

(For more about Federal Codes, see our Misc Page for Rock Island)

About Illinois

From the US Census

Population

Year	Population
2019 Est:	12,667,017 (1.28% decrease since 2010)
2010:	12,830,632 (3.31% increase since 2000)
2000:	12,419,293

Websites for State of Illinois

Official Website: https://www.illinois.gov/

Tourism: https://www.enjoyillinois.com/

Parks: https://dnr.illinois.gov/

Fishing: https://www.ifishillinois.org/

Hunting: https://dnr.illinois.gov/hunting.html

Federal GNIS/FIPS Codes for State of Illinois

GNIS ID: 1779784

FIPS State: 17

(For more about Federal Codes, see our Misc Page for Rock Island)

Footnotes ...

<1>	When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 309 code has been Overlayed with the 861 area code. New phone numbers in the Rock Island area will be assigned with one of these codes: 309 or 861. As a result, placing a call in the Rock Island area will require 10-digit dialing (where you enter both the area code and then the phone number).
<2>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as Rock Island). When looking for a ZIP Code, whether Rock Island or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<3>	The elevation is an estimate for the area around Rock Island - it will be higher in some places and lower in others.
<4>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<5>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Rock Island. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<6>	A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).
<7>	Longitude & latitude values may not be the geographic center of Rock Island, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<8>	Name of the USGS 7.5 Minute topographic map which includes Rock Island.