Plain

County ZIP codes · Illinois · FIPS 17017

Cass County, IL ZIP Codes

Cass 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 Cass County and 2 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $62,875 in 62611 (Arenzville) to $84,267 in 62675 (Petersburg) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Cass County?

62611 · Arenzville: $63k62612 · Ashland: $70k62618 · Beardstown: $65k62622 · Bluff Springs: –62627 · Chandlerville: $63k62673 · Oakford: $68k62675 · Petersburg: $84k62691 · Virginia: $79k626756261862611626276269162612626736262262611 · Arenzville: $63k62612 · Ashland: $70k62618 · Beardstown: $65k62622 · Bluff Springs: –62627 · Chandlerville: $63k62673 · Oakford: $68k62675 · Petersburg: $84k62691 · Virginia: $79k6267562618626116262762691626126267362611 · Arenzville: $63k62612 · Ashland: $70k62618 · Beardstown: $65k62622 · Bluff Springs: –62627 · Chandlerville: $63k62673 · Oakford: $68k62675 · Petersburg: $84k62691 · Virginia: $79k62675626186261162627626916261262673
The residential ZIP codes of Cass 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 $63,235 and $69,569.

They carry 8 postal town names: Beardstown, Petersburg, Virginia, Ashland, Arenzville, Chandlerville, Oakford, Bluff Springs.

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

All 8 residential ZIP codes in Cass County

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

Residential ZIP codes mainly in Cass County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62618 Beardstown 7,428 74 $65k $89k 100%
62691 Virginia 2,349 23 $79k $115k 100%
62612 Ashland 1,398 15 $70k $113k 62%
62611 Arenzville 1,047 14 $63k $160k 66%
62627 Chandlerville 1,006 12 $63k $84k 62%
62622 Bluff Springs 100 28 – – 100%

Partly in Cass County

Residential ZIP codes mainly in another county that reach at least 1% into Cass County, by their share here
In this county
62673 Oakford 361 13 $68k $153k 31%
62675 Petersburg 6,170 54 $84k $204k 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?

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

Share of each ZIP code's land in Cass County and in the neighboring counties
ZIPIn CassElsewhere
626752%Menard County98%
6261262%Morgan County38%
6261166%Morgan County34%
6262762%Mason County38%
6267331%Menard County69%

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

Which first three digits do Cass 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 Cass County starts with 626.

Three-digit prefixes of Cass 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 Cass County's
PrefixSectional centerHereAll codes
626Springfield, IL (SCF 625)862

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