Alexander County, Illinois
Alexander County, Illinois, has 4,570 residents (July 2025 estimate). Its county seat is Cairo. It uses Central Time and covers 235 sq mi (610 km²) of land.
- Resident population, July 2025
- 4,570
- Land area
- 235 sq mi (610 km²)
- County seat or government
- Cairo
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $47,043 ± $5,354
- Median home value
- $59,800 ± $7,126
- Median rent, with utilities
- $656 ± $155
- Homes lived in by their owners
- 77.6% ± 4.3 points
- County type
- County
- Metro or micro area
- Cape Girardeau, MO-IL metro areaOutlying county
- Water area
- 17.2 sq mi (44.6 km²)
- State
- Illinois
- County code (FIPS)
- 17003
- Coordinates (central point)
- 37.183658, -89.349516
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Alexander County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 629522,852 people
- 629141,765 people
- 629881,149 people
- 62990973 people
- 62957640 people
- 62992629 people
- 62969314 people
- 629620 people
8 ZIP Code areas overlap Alexander County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Precincts in Alexander County, largest first
- Cairo Precinct1,682 people
- Tamms Precinct996 people
- Thebes Precinct843 people
- McClure Precinct631 people
- Olive Branch Precinct499 people
- Sandusky Precinct141 people
- Cache Precinct83 people
People counts are American Community Survey 2020–2024 5-year estimates. All precincts in Illinois, by county
School districts in Alexander County, largest first
- Meridian Community Unit School District 1013,092 people
- Egyptian Community Unit School District 52,440 people
- Century Community Unit School District 1002,119 people
- Cairo Community Unit School District 11,765 people
- Shawnee Community Unit School District 841,745 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Cairo, Illinois (city)1,682 people
- Tamms, Illinois (village)589 people
- Olive Branch, Illinois (CDP)499 people
- Thebes, Illinois (village)353 people
- East Cape Girardeau, Illinois (village)283 people
- McClure, Illinois (village)239 people
- Unity, Illinois (CDP)77 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Pulaski County, Illinois12 mi east
- Scott County, Missouri15 mi southwest
- Ballard County, Kentucky21 mi southeast
- Union County, Illinois22 mi north
- Cape Girardeau County, Missouri23 mi northwest
- Mississippi County, Missouri25 mi south
Before using this answer on a form
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