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County ZIP codes · Missouri · FIPS 29021

Buchanan County, MO ZIP Codes

Buchanan County, Missouri has 16 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 14 residential and 2 for PO boxes or a single organization. 10 of the residential ones lie mainly in Buchanan County and 4 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $46,731 in 64501 (Saint Joseph) to $99,398 in 64401 (Agency) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Buchanan County?

64401 · Agency: $99k64439 · Dearborn: $91k64440 · De Kalb: $94k64443 · Easton: $86k64444 · Edgerton: $69k64448 · Faucett: $76k64454 · Gower: $87k64484 · Rushville: $78k64501 · Saint Joseph: $47k64503 · Saint Joseph: $53k64504 · Saint Joseph: $59k64505 · Saint Joseph: $73k64506 · Saint Joseph: $66k64507 · Saint Joseph: $61k6448464507644546443964505645046444464443644016444864503644406450664401 · Agency: $99k64439 · Dearborn: $91k64440 · De Kalb: $94k64443 · Easton: $86k64444 · Edgerton: $69k64448 · Faucett: $76k64454 · Gower: $87k64484 · Rushville: $78k64501 · Saint Joseph: $47k64503 · Saint Joseph: $53k64504 · Saint Joseph: $59k64505 · Saint Joseph: $73k64506 · Saint Joseph: $66k64507 · Saint Joseph: $61k6448464507644546443964505645046444464443644016444864503644406450664401 · Agency: $99k64439 · Dearborn: $91k64440 · De Kalb: $94k64443 · Easton: $86k64444 · Edgerton: $69k64448 · Faucett: $76k64454 · Gower: $87k64484 · Rushville: $78k64501 · Saint Joseph: $47k64503 · Saint Joseph: $53k64504 · Saint Joseph: $59k64505 · Saint Joseph: $73k64506 · Saint Joseph: $66k64507 · Saint Joseph: $61k644846450764454644396450564504644446444364401644486450364440
The residential ZIP codes of Buchanan 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 $58,801 and $87,262.

They carry 9 postal town names.

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

All 14 residential ZIP codes in Buchanan County

10 ZIP codes lie mainly in Buchanan County; 4 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Buchanan County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
64506 Saint Joseph 21,461 2,141 $66k $240k 96%
64507 Saint Joseph 13,991 251 $61k $140k 99%
64503 Saint Joseph 11,954 826 $53k $141k 100%
64501 Saint Joseph 10,689 2,879 $47k $99k 100%
64504 Saint Joseph 10,068 214 $59k $127k 100%
64401 Agency 1,757 47 $99k $272k 100%
64443 Easton 1,249 26 $86k $300k 100%
64484 Rushville 940 13 $78k $163k 66%
64448 Faucett 912 23 $76k $259k 100%
64440 De Kalb 900 25 $94k $188k 91%

Partly in Buchanan County

Residential ZIP codes mainly in another county that reach at least 1% into Buchanan County, by their share here
In this county
64454 Gower 2,941 41 $87k $261k 44%
64439 Dearborn 1,537 28 $91k $286k 41%
64505 Saint Joseph 14,107 309 $73k $191k 23%
64444 Edgerton 1,043 30 $69k $234k 19%

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?

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

Share of each ZIP code's land in Buchanan County and in the neighboring counties
ZIPIn BuchananElsewhere
6450696%Andrew County4%
6450523%Andrew County77%
6450799%Andrew County1%
6445444%Clinton County56%
6443941%Platte County59%
6444419%Platte County77%; Clinton County4%
6448466%Platte County34%
6444091%Platte County9%

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

PO Box and single-organization ZIP codes

ZIP codes in Buchanan County without a residential area (GeoNames postal codes)
ZIPPostal name
64502Saint Joseph
64508Saint Joseph

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Buchanan County's ZIP codes use 2 prefixes: 644 and 645.

Three-digit prefixes of Buchanan 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 Buchanan County's
PrefixSectional centerHereAll codes
644Kansas City, MO (SCF 640)870
645Kansas City, MO (SCF 640)88

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