Alexander County, Illinois
Alexander County: county in Illinois, United States
About
Alexander County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 8,238 and a population density of 13 people per km². After 10 years in 2020 county had an estimated population of 5,497 inhabitants. Its county seat is Cairo. The county was created 207 years ago in 1819.
County Snapshot
Alexander County at a glance
Alexander County currently has 7 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
7
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Illinois counties
102
Open related pagesLargest city
CairoPopulation 1,989
Top linked places
Quick Facts about Alexander County
| Population | 5,497 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Different from | Alexander County |
| Area | 654 km2 |
| Water as percent of area | 6.8% |
| Land as percent of area | 93.2% |
| Latitude & Longitude | 37.1916,-89.3376 |
| Named for | William M. Alexander |
| Capital | Cairo |
| Establishment | March 04, 1819 |
| Time Zone | America/Chicago |
| Local time | 00:20:49 (18th April 2026) |
| Density | 8 Pop. per km² as of 2020 |
| Population growth | -49.86% (2010-2020) |
| Weather | 70℉ Showers And Thunderstorms 7-days weather |
Geography
Alexander County is located at 37°11'30"N 89°20'16"W (37.1916000, -89.3376400). It has 6 neighbors: Pulaski County, Union County, Ballard County, Cape Girardeau County, Mississippi County and Scott County.
Alexander County map
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The largest city of Alexander County is Cairo with a population of 1,989. Other cities include, Unity population 1,341, Olive Branch population 864, Tamms population 449 and Thebes population 303. See all Alexander County cities & populated places.
Alexander County Populated Places
Cities, towns, neighborhoods & other populated places in Alexander County.
| City Name | Population | Title |
|---|---|---|
| Cairo | 1,989 | City in Illinois, United States |
| Unity | 1,341 | Unincorporated community in Illinois |
| Olive Branch | 864 | City in Alexander County, Illinois, United States of America |
| Tamms | 449 | City in Alexander County, Illinois, United States of America |
| Thebes | 303 | Village in Illinois, USA |
| McClure | 285 | Human settlement in United States of America |
| East Cape Girardeau | 268 | Town |
Weather
Showers and thunderstorms. Mostly cloudy, with a high near 70. West northwest wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation...
7-Day ForecastDemographics
According to census records, the population of Alexander County decreased by 49.86% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 8,238 | - | census |
| 2011 | 7,992 | -3.08% | estimation process |
| 2012 | 7,717 | -3.56% | estimation process |
| 2013 | 7,238 | -6.62% | estimation process |
| 2014 | 7,083 | -2.19% | estimation process |
| 2015 | 6,762 | -4.75% | estimation process |
| 2016 | 6,459 | -4.69% | estimation process |
| 2017 | 6,278 | -2.88% | estimation process |
| 2018 | 6,041 | -3.92% | estimation process |
| 2019 | 5,761 | -4.86% | estimation process |
| 2020 | 5,497 | -4.8% | estimation process |
Other places with the same name (1)
- Alexander County, North Carolina county in Illinois, United States with a population of 37,441 people.
Illinois Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Cook County | 5,108,284 | County in Illinois, United States |
| Chicago | 2,677,643 | The third most populous city in the United States and the center of the Chicago metropolitan area. |
| DuPage County | 917,481 | County in Illinois, United States |
| Lake County | 693,593 | County in Oregon, United States |
| Will County | 688,726 | County in Illinois, United States |
| Kane County | 531,010 | County in southern Utah, United States |
| McHenry County | 305,888 | County in Illinois, United States |
| Winnebago County | 281,295 | County in Illinois, United States |
| Madison County | 262,635 | County in Montana, United States |
| Saint Clair County | 258,046 | The County of St. |
| Champaign County | 209,192 | County in Illinois, United States |
| Aurora | 196,383 | The second most populous city in Illinois. |
| Sangamon County | 193,882 | County in Illinois, United States |
| Peoria County | 177,652 | County in Illinois, United States of America |
| McLean County | 171,256 | County in North Dakota, United States |
| Naperville | 147,986 | The second most populous city in Illinois. |