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County ZIP codes · Illinois · FIPS 17003

Alexander County, IL ZIP Codes

Alexander County, Illinois has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 8 residential and 1 for PO boxes or a single organization. 6 of the residential ones lie mainly in Alexander County and 2 mainly in a neighboring county; 3 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Alexander County?

62914 · Cairo: $41k62952 · Jonesboro: $64k62957 · McClure: $46k62962 · Miller City: –62969 · Olive Branch: –62988 · Tamms: $55k62990 · Thebes: $64k62992 · Ullin: $63k629526298862957629626299262990629146296962914 · Cairo: $41k62952 · Jonesboro: $64k62957 · McClure: $46k62962 · Miller City: –62969 · Olive Branch: –62988 · Tamms: $55k62990 · Thebes: $64k62992 · Ullin: $63k629526298862957629626299262990629146296962914 · Cairo: $41k62952 · Jonesboro: $64k62957 · McClure: $46k62962 · Miller City: –62969 · Olive Branch: –62988 · Tamms: $55k62990 · Thebes: $64k62992 · Ullin: $63k6295262988629576296262992629906291462969
The residential ZIP codes of Alexander County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

All 8 residential ZIP codes in Alexander County

6 ZIP codes lie mainly in Alexander County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Alexander County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62914 Cairo 1,765 88 $41k $32k 100%
62988 Tamms 1,149 16 $55k $66k 100%
62990 Thebes 973 22 $64k $137k 100%
62957 McClure 640 14 $46k $71k 79%
62969 Olive Branch 314 22 – $62k 100%
62962 Miller City no residents 0 – – 100%

Partly in Alexander County

Residential ZIP codes mainly in another county that reach at least 1% into Alexander County, by their share here
In this county
62992 Ullin 629 17 $63k $59k 18%
62952 Jonesboro 2,852 30 $64k $119k 2%

Download the 9 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

3 ZIP codes of Alexander County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Alexander County and in the neighboring counties
ZIPIn AlexanderElsewhere
629522%Union County98%
6295779%Union County21%
6299218%Pulaski County82%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Alexander County without a residential area (GeoNames postal codes)
ZIPPostal name
62993Unity

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Alexander County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Alexander County starts with 629.

Three-digit prefixes of Alexander County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Alexander County's
PrefixSectional centerHereAll codes
629St Louis, MO (SCF 630)983

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.