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County ZIP codes · Illinois · FIPS 17157

Randolph County, IL ZIP Codes

Randolph County, Illinois has 18 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 17 residential and 1 for PO boxes or a single organization. 11 of the residential ones lie mainly in Randolph County and 6 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $50,938 in 62272 (Percy) to $84,556 in 62233 (Chester) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Randolph County?

62217 · Baldwin: $85k62233 · Chester: $85k62237 · Coulterville: $55k62241 · Ellis Grove: $83k62242 · Evansville: $60k62257 · Marissa: $79k62261 · Modoc: –62272 · Percy: $51k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62280 · Rockwood: $62k62286 · Sparta: $61k62288 · Steeleville: $67k62292 · Tilden: $48k62297 · Walsh: $91k62916 · Campbell Hill: $86k63673 · Saint Mary: $78k6367362286622576223762278622336228062277629166224262241622886221762297622726226162217 · Baldwin: $85k62233 · Chester: $85k62237 · Coulterville: $55k62241 · Ellis Grove: $83k62242 · Evansville: $60k62257 · Marissa: $79k62261 · Modoc: –62272 · Percy: $51k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62280 · Rockwood: $62k62286 · Sparta: $61k62288 · Steeleville: $67k62292 · Tilden: $48k62297 · Walsh: $91k62916 · Campbell Hill: $86k63673 · Saint Mary: $78k63673622866225762237622786223362280622776291662242622416228862217622976226162217 · Baldwin: $85k62233 · Chester: $85k62237 · Coulterville: $55k62241 · Ellis Grove: $83k62242 · Evansville: $60k62257 · Marissa: $79k62261 · Modoc: –62272 · Percy: $51k62277 · Prairie Du Rocher: $68k62278 · Red Bud: $80k62280 · Rockwood: $62k62286 · Sparta: $61k62288 · Steeleville: $67k62292 · Tilden: $48k62297 · Walsh: $91k62916 · Campbell Hill: $86k63673 · Saint Mary: $78k6367362286622576223762278622336228062277629166224262241622886221762297
The residential ZIP codes of Randolph 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 $60,400 and $78,750.

They carry 17 postal town names.

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

All 17 residential ZIP codes in Randolph County

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

Residential ZIP codes mainly in Randolph County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62233 Chester 8,326 122 $85k $121k 100%
62286 Sparta 5,491 55 $61k $118k 100%
62288 Steeleville 2,820 77 $67k $178k 100%
62242 Evansville 1,660 33 $60k $122k 100%
62272 Percy 1,521 47 $51k $84k 82%
62277 Prairie Du Rocher 940 14 $68k $128k 61%
62241 Ellis Grove 879 23 $83k $149k 100%
62217 Baldwin 767 25 $85k $146k 100%
62292 Tilden 762 451 $48k $70k 100%
62297 Walsh 158 7 $91k $121k 100%
62261 Modoc 80 3 – – 100%

Partly in Randolph County

Residential ZIP codes mainly in another county that reach at least 1% into Randolph County, by their share here
In this county
62278 Red Bud 6,281 60 $80k $178k 46%
62280 Rockwood 421 8 $62k $211k 43%
62237 Coulterville 2,367 26 $55k $150k 25%
62916 Campbell Hill 925 20 $86k $101k 22%
63673 Saint Mary 2,340 20 $78k $236k 20%
62257 Marissa 2,046 25 $79k $138k 7%

Download the 18 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?

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

Share of each ZIP code's land in Randolph County and in the neighboring counties
ZIPIn RandolphElsewhere
6227846%Monroe County 54%
6223725%Perry County 49%; Washington County 26%
6367320%Ste. Genevieve County 49%; Perry County 30%
622577%St. Clair County 57%; Washington County 36%
6227282%Perry County 17%; Jackson County 1%
6227761%Monroe County 39%
6291622%Jackson County 48%; Perry County 30%
6228043%Jackson County 57%

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

PO Box and single-organization ZIP codes

ZIP codes in Randolph County without a residential area (GeoNames postal codes)
ZIPPostal name
62259Menard

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Randolph County's ZIP codes use 3 prefixes: 622, 629 and 636.

Three-digit prefixes of Randolph 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 Randolph County's
PrefixSectional centerHereAll codes
622 St Louis, MO (SCF 630) 16 79
629 St Louis, MO (SCF 630) 1 83
636 St Louis, MO (SCF 630) 1 37

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