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County ZIP codes · Iowa · FIPS 19017

Bremer County, IA ZIP Codes

Bremer County, Iowa has 13 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Bremer County and 5 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $71,518 in 50630 (Fredericksburg) to $104,063 in 50647 (Janesville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Bremer County?

50622 · Denver: $95k50629 · Fairbank: $103k50630 · Fredericksburg: $72k50631 · Frederika: $59k50645 · Ionia: $64k50647 · Janesville: $104k50658 · Nashua: $72k50666 · Plainfield: $80k50668 · Readlyn: $86k50670 · Shell Rock: $85k50674 · Sumner: $73k50676 · Tripoli: $87k50677 · Waverly: $86k50674506455067750629506305065850676506705066650668506225064750622 · Denver: $95k50629 · Fairbank: $103k50630 · Fredericksburg: $72k50631 · Frederika: $59k50645 · Ionia: $64k50647 · Janesville: $104k50658 · Nashua: $72k50666 · Plainfield: $80k50668 · Readlyn: $86k50670 · Shell Rock: $85k50674 · Sumner: $73k50676 · Tripoli: $87k50677 · Waverly: $86k50674506455067750629506305065850676506705066650668506225064750622 · Denver: $95k50629 · Fairbank: $103k50630 · Fredericksburg: $72k50631 · Frederika: $59k50645 · Ionia: $64k50647 · Janesville: $104k50658 · Nashua: $72k50666 · Plainfield: $80k50668 · Readlyn: $86k50670 · Shell Rock: $85k50674 · Sumner: $73k50676 · Tripoli: $87k50677 · Waverly: $86k506745064550677506295063050658506765067050666506685062250647
The residential ZIP codes of Bremer 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 $72,794 and $87,115.

They carry 13 postal town names.

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

All 13 residential ZIP codes in Bremer County

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

Residential ZIP codes mainly in Bremer County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
50677 Waverly 12,673 99 $86k $233k 97%
50622 Denver 3,549 138 $95k $254k 100%
50674 Sumner 3,446 22 $73k $174k 62%
50676 Tripoli 2,017 36 $87k $155k 100%
50647 Janesville 1,978 65 $104k $314k 62%
50668 Readlyn 1,216 36 $86k $174k 100%
50666 Plainfield 753 15 $80k $204k 76%
50631 Frederika 225 1,216 $59k $99k 100%

Partly in Bremer County

Residential ZIP codes mainly in another county that reach at least 1% into Bremer County, by their share here
In this county
50629 Fairbank 2,082 28 $103k $207k 29%
50630 Fredericksburg 1,372 16 $72k $199k 10%
50645 Ionia 1,193 14 $64k $115k 7%
50658 Nashua 2,450 31 $72k $155k 4%
50670 Shell Rock 2,270 41 $85k $172k 2%

Download the 13 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?

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

Share of each ZIP code's land in Bremer County and in the neighboring counties
ZIPIn BremerElsewhere
5067797%Butler County3%
5067462%Fayette County32%; Chickasaw County6%
506584%Chickasaw County55%; Floyd County34%; Butler County7%
506702%Butler County97%
5062929%Buchanan County32%; Fayette County22%; Black Hawk County16%
5064762%Black Hawk County38%
5063010%Chickasaw County90%
506457%Chickasaw County90%; Floyd County3%
5066676%Butler County24%

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

Which first three digits do Bremer 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 Bremer County starts with 506.

Three-digit prefixes of Bremer 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 Bremer County's
PrefixSectional centerHereAll codes
506Waterloo, IA (SCF 506)1370

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