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County ZIP codes · Illinois · FIPS 17133

Monroe County, IL ZIP Codes

Monroe County, Illinois has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Monroe County and 2 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $57,015 in 62264 (New Athens) to $108,981 in 62236 (Columbia) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Monroe County?

62236 · Columbia: $109k62244 · Fults: $108k62248 · Hecker: $80k62256 · Maeystown: $126k62264 · New Athens: $57k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62279 · Renault: $139k62295 · Valmeyer: $88k62298 · Waterloo: $101k6229862295622786223662264622776224462236 · Columbia: $109k62244 · Fults: $108k62248 · Hecker: $80k62256 · Maeystown: $126k62264 · New Athens: $57k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62279 · Renault: $139k62295 · Valmeyer: $88k62298 · Waterloo: $101k6229862295622786223662264622776224462236 · Columbia: $109k62244 · Fults: $108k62248 · Hecker: $80k62256 · Maeystown: $126k62264 · New Athens: $57k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62279 · Renault: $139k62295 · Valmeyer: $88k62298 · Waterloo: $101k62298622956227862236622646227762244
The residential ZIP codes of Monroe 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).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $79,688 and $101,155.

They carry 10 postal town names.

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

All 10 residential ZIP codes in Monroe County

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

Residential ZIP codes mainly in Monroe County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62298 Waterloo 18,208 127 $101k $290k 91%
62236 Columbia 14,154 235 $109k $307k 82%
62278 Red Bud 6,281 60 $80k $178k 54%
62295 Valmeyer 1,459 21 $88k $203k 100%
62244 Fults 928 20 $108k $252k 100%
62248 Hecker 521 2,067 $80k $167k 100%
62279 Renault 112 68 $139k – 100%
62256 Maeystown 35 294 $126k $158k 100%

Partly in Monroe County

Residential ZIP codes mainly in another county that reach at least 1% into Monroe County, by their share here
In this county
62277 Prairie Du Rocher 940 14 $68k $128k 39%
62264 New Athens 3,097 47 $57k $127k 6%

Download the 10 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?

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

Share of each ZIP code's land in Monroe County and in the neighboring counties
ZIPIn MonroeElsewhere
6229891%St. Clair County 9%
6223682%St. Clair County 18%
6227854%Randolph County 46%
622646%St. Clair County 94%
6227739%Randolph County 61%

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

Which first three digits do Monroe 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 Monroe County starts with 622.

Three-digit prefixes of Monroe 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 Monroe County's
PrefixSectional centerHereAll codes
622 St Louis, MO (SCF 630) 10 79

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