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County ZIP codes · Illinois · FIPS 17159

Richland County, IL ZIP Codes

Richland County, Illinois has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 6 of the residential ones lie mainly in Richland County and 2 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $61,645 in 62868 (Noble) to $74,179 in 62448 (Newton) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Richland County?

62419 · Calhoun: $96k62421 · Claremont: $56k62425 · Dundas: $54k62448 · Newton: $74k62450 · Olney: $62k62452 · Parkersburg: $78k62466 · Sumner: $78k62868 · Noble: $62k624486245062466628686242162425624196245262419 · Calhoun: $96k62421 · Claremont: $56k62425 · Dundas: $54k62448 · Newton: $74k62450 · Olney: $62k62452 · Parkersburg: $78k62466 · Sumner: $78k62868 · Noble: $62k624486245062466628686242162425624196245262419 · Calhoun: $96k62421 · Claremont: $56k62425 · Dundas: $54k62448 · Newton: $74k62450 · Olney: $62k62452 · Parkersburg: $78k62466 · Sumner: $78k62868 · Noble: $62k62448624506246662868624216242562419
The residential ZIP codes of Richland 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?

They carry 8 postal town names: Olney, Newton, Sumner, Noble, Dundas, Parkersburg, Claremont, Calhoun.

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

All 8 residential ZIP codes in Richland County

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

Residential ZIP codes mainly in Richland County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62450 Olney 12,327 78 $62k $117k 99%
62868 Noble 1,463 14 $62k $116k 67%
62425 Dundas 838 21 $54k $107k 83%
62452 Parkersburg 387 19 $78k $78k 100%
62421 Claremont 366 7 $56k $85k 93%
62419 Calhoun 352 17 $96k $106k 100%

Partly in Richland County

Residential ZIP codes mainly in another county that reach at least 1% into Richland County, by their share here
In this county
62466 Sumner 4,001 29 $78k $99k 2%
62448 Newton 5,356 26 $74k $127k 2%

Download the 8 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?

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

Share of each ZIP code's land in Richland County and in the neighboring counties
ZIPIn RichlandElsewhere
6245099%
624482%Jasper County 97%; Clay County 1%
624662%Lawrence County 89%; Crawford County 9%
6286867%Clay County 17%; Wayne County 16%
6242583%Jasper County 17%
6242193%Crawford County 6%; Lawrence County 1%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Richland County's ZIP codes use 2 prefixes: 624 and 628.

Three-digit prefixes of Richland 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 Richland County's
PrefixSectional centerHereAll codes
624 Champaign, IL (SCF 618) 7 61
628 St Louis, MO (SCF 630) 1 90

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