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County ZIP codes · Illinois · FIPS 17147

Piatt County, IL ZIP Codes

Piatt County, Illinois has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 11 of the residential ones lie mainly in Piatt County and 5 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $65,500 in 61913 (Atwood) to $115,512 in 61853 (Mahomet) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Piatt County?

61813 · Bement: $84k61818 · Cerro Gordo: $84k61830 · Cisco: $67k61839 · De Land: $56k61842 · Farmer City: $80k61851 · Ivesdale: $59k61853 · Mahomet: $116k61854 · Mansfield: $87k61855 · Milmine: –61856 · Monticello: $104k61875 · Seymour: $119k61882 · Weldon: $80k61884 · White Heath: $106k61913 · Atwood: $66k61929 · Hammond: $79k61936 · La Place: –61842618566185361813618546188261851618186192961830619136187561884618396185561813 · Bement: $84k61818 · Cerro Gordo: $84k61830 · Cisco: $67k61839 · De Land: $56k61842 · Farmer City: $80k61851 · Ivesdale: $59k61853 · Mahomet: $116k61854 · Mansfield: $87k61855 · Milmine: –61856 · Monticello: $104k61875 · Seymour: $119k61882 · Weldon: $80k61884 · White Heath: $106k61913 · Atwood: $66k61929 · Hammond: $79k61936 · La Place: –61842618566185361813618546188261851618186192961830619136187561884618396185561813 · Bement: $84k61818 · Cerro Gordo: $84k61830 · Cisco: $67k61839 · De Land: $56k61842 · Farmer City: $80k61851 · Ivesdale: $59k61853 · Mahomet: $116k61854 · Mansfield: $87k61855 · Milmine: –61856 · Monticello: $104k61875 · Seymour: $119k61882 · Weldon: $80k61884 · White Heath: $106k61913 · Atwood: $66k61929 · Hammond: $79k61936 · La Place: –61842618566185361813618546188261851618186192961830619136187561839
The residential ZIP codes of Piatt 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 $80,117 and $86,705.

They carry 16 postal town names.

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

All 16 residential ZIP codes in Piatt County

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

Residential ZIP codes mainly in Piatt County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
61856 Monticello 8,226 76 $104k $231k 100%
61813 Bement 2,043 32 $84k $104k 100%
61818 Cerro Gordo 1,560 40 $84k $116k 86%
61913 Atwood 1,300 32 $66k $129k 48%
61854 Mansfield 1,299 23 $87k $166k 95%
61884 White Heath 973 40 $106k $258k 79%
61929 Hammond 672 17 $79k $107k 99%
61839 De Land 558 17 $56k $93k 100%
61830 Cisco 510 15 $67k $161k 72%
61936 La Place 170 56 – $87k 100%
61855 Milmine 24 2 – $220k 100%

Partly in Piatt County

Residential ZIP codes mainly in another county that reach at least 1% into Piatt County, by their share here
In this county
61842 Farmer City 2,620 24 $80k $158k 19%
61851 Ivesdale 279 8 $59k $148k 11%
61853 Mahomet 14,831 309 $116k $282k 8%
61882 Weldon 777 20 $80k $137k 7%
61875 Seymour 846 27 $119k $277k 1%

Download the 16 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?

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

Share of each ZIP code's land in Piatt County and in the neighboring counties
ZIPIn PiattElsewhere
618538%Champaign County 92%
6184219%De Witt County 63%; McLean County 18%
6181886%Macon County 14%
6191348%Douglas County 48%; Moultrie County 4%
6185495%McLean County 5%
6188479%Champaign County 21%
618751%Champaign County 99%
618827%De Witt County 90%; Macon County 3%
6192999%
6183072%Macon County 28%
6185111%Champaign County 89%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Piatt County's ZIP codes use 2 prefixes: 618 and 619.

Three-digit prefixes of Piatt 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 Piatt County's
PrefixSectional centerHereAll codes
618 Champaign, IL (SCF 618) 13 62
619 Champaign, IL (SCF 618) 3 30

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