County ZIP codes · Minnesota · FIPS 27103
Nicollet County, MN ZIP Codes
Nicollet County, Minnesota has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 5 of the residential ones lie mainly in Nicollet County and 5 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $62,206 in 55335 (Gibbon) to $96,563 in 56021 (Courtland) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Nicollet County?
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 $66,149 and $86,677.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 10 residential ZIP codes in Nicollet County
5 ZIP codes lie mainly in Nicollet County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 56003 | Mankato | 15,258 | 347 | $83k | $270k | 100% |
| 56082 | Saint Peter | 14,606 | 118 | $72k | $275k | 87% |
| 56074 | Nicollet | 1,845 | 24 | $93k | $294k | 100% |
| 56021 | Courtland | 1,108 | 31 | $97k | $277k | 100% |
| 56054 | Lafayette | 853 | 16 | $93k | $198k | 84% |
Partly in Nicollet County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 56073 | New Ulm | 17,339 | 86 | $70k | $219k | 38% |
| 55332 | Fairfax | 1,667 | 15 | $62k | $144k | 17% |
| 55335 | Gibbon | 1,666 | 15 | $62k | $149k | 16% |
| 55334 | Gaylord | 2,727 | 32 | $66k | $193k | 11% |
| 56058 | Le Sueur | 6,067 | 48 | $87k | $280k | 11% |
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 Nicollet County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Nicollet | Elsewhere |
|---|---|---|
| 56073 | 38% | Brown County 56%; Blue Earth County 6% |
| 56082 | 87% | Le Sueur County 13% |
| 56058 | 11% | Le Sueur County 63%; Sibley County 26% |
| 55334 | 11% | Sibley County 88% |
| 55332 | 17% | Renville County 82%; Sibley County 2% |
| 55335 | 16% | Sibley County 84% |
| 56054 | 84% | Sibley County 16% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Nicollet County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Nicollet County's ZIP codes use 2 prefixes: 553 and 560.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.