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County ZIP codes · Illinois · FIPS 17127

Massac County, IL ZIP Codes

Massac County, Illinois has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 5 of the residential ones lie mainly in Massac County and 3 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $59,514 in 62910 (Brookport) to $73,462 in 62956 (Karnak) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Massac County?

62908 · Belknap: $90k62910 · Brookport: $60k62938 · Golconda: $64k62941 · Grand Chain: $48k62943 · Grantsburg: $83k62953 · Joppa: $42k62956 · Karnak: $74k62960 · Metropolis: $63k6293862960629106290862941629436295662908 · Belknap: $90k62910 · Brookport: $60k62938 · Golconda: $64k62941 · Grand Chain: $48k62943 · Grantsburg: $83k62953 · Joppa: $42k62956 · Karnak: $74k62960 · Metropolis: $63k6293862960629106290862941629436295662908 · Belknap: $90k62910 · Brookport: $60k62938 · Golconda: $64k62941 · Grand Chain: $48k62943 · Grantsburg: $83k62953 · Joppa: $42k62956 · Karnak: $74k62960 · Metropolis: $63k62938629606291062908629416294362956
The residential ZIP codes of Massac 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 $59,514 and $63,780.

They carry 8 postal town names: Metropolis, Golconda, Brookport, Karnak, Grand Chain, Belknap, Grantsburg, Joppa.

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

All 8 residential ZIP codes in Massac County

5 ZIP codes lie mainly in Massac County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Massac County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
62960 Metropolis 10,783 96 $63k $133k 98%
62910 Brookport 1,993 19 $60k $85k 56%
62956 Karnak 1,172 43 $74k $129k 51%
62908 Belknap 440 9 $90k $161k 65%
62953 Joppa 259 481 $42k $45k 100%

Partly in Massac County

Residential ZIP codes mainly in another county that reach at least 1% into Massac County, by their share here
In this county
62941 Grand Chain 639 21 $48k $139k 26%
62943 Grantsburg 428 11 $83k $139k 24%
62938 Golconda 2,622 16 $64k $114k 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?

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

Share of each ZIP code's land in Massac County and in the neighboring counties
ZIPIn MassacElsewhere
6296098%Pope County 2%
629382%Pope County 94%; Hardin County 4%
6291056%Pope County 44%
6295651%Pulaski County 49%
6294126%Pulaski County 74%
6290865%Johnson County 35%
6294324%Johnson County 61%; Pope County 15%

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

Which first three digits do Massac 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 Massac County starts with 629.

Three-digit prefixes of Massac 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 Massac County's
PrefixSectional centerHereAll codes
629 St Louis, MO (SCF 630) 8 83

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