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County ZIP codes · Missouri · FIPS 29025

Caldwell County, MO ZIP Codes

Caldwell County, Missouri has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Caldwell County and 3 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $58,095 in 64624 (Braymer) to $92,277 in 64062 (Lawson) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Caldwell County?

64062 · Lawson: $92k64429 · Cameron: $69k64465 · Lathrop: $81k64624 · Braymer: $58k64625 · Breckenridge: $35k64637 · Cowgill: $57k64644 · Hamilton: $74k64649 · Kidder: $67k64650 · Kingston: $45k64671 · Polo: $76k6442964624646446467164465640626463764625646506464964062 · Lawson: $92k64429 · Cameron: $69k64465 · Lathrop: $81k64624 · Braymer: $58k64625 · Breckenridge: $35k64637 · Cowgill: $57k64644 · Hamilton: $74k64649 · Kidder: $67k64650 · Kingston: $45k64671 · Polo: $76k6442964624646446467164465640626463764625646506464964062 · Lawson: $92k64429 · Cameron: $69k64465 · Lathrop: $81k64624 · Braymer: $58k64625 · Breckenridge: $35k64637 · Cowgill: $57k64644 · Hamilton: $74k64649 · Kidder: $67k64650 · Kingston: $45k64671 · Polo: $76k64429646246464464671644656406264637646256465064649
The residential ZIP codes of Caldwell 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 $68,708 and $75,455.

They carry 10 postal town names.

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

All 10 residential ZIP codes in Caldwell County

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

Residential ZIP codes mainly in Caldwell County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
64644 Hamilton 2,923 27 $74k $194k 80%
64671 Polo 1,986 21 $76k $173k 61%
64624 Braymer 1,489 12 $58k $96k 49%
64649 Kidder 814 23 $67k $228k 58%
64625 Breckenridge 738 11 $35k $64k 66%
64650 Kingston 665 16 $45k $203k 100%
64637 Cowgill 492 7 $57k $125k 76%

Partly in Caldwell County

Residential ZIP codes mainly in another county that reach at least 1% into Caldwell County, by their share here
In this county
64429 Cameron 11,449 76 $69k $207k 31%
64465 Lathrop 3,947 42 $81k $192k 14%
64062 Lawson 6,968 81 $92k $274k 2%

Download the 10 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 Caldwell County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Caldwell County and in the neighboring counties
ZIPIn CaldwellElsewhere
6442931%DeKalb County 33%; Clinton County 31%; Daviess County 6%
640622%Ray County 73%; Clay County 13%; Clinton County 11%
6446514%Clinton County 86%
6464480%Daviess County 20%
6467161%Ray County 39%
6462449%Carroll County 26%; Ray County 18%; Livingston County 6%
6464958%Daviess County 42%
6462566%Daviess County 23%; Livingston County 11%
6463776%Ray County 24%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Caldwell County's ZIP codes use 3 prefixes: 640, 644 and 646.

Three-digit prefixes of Caldwell 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 Caldwell County's
PrefixSectional centerHereAll codes
640 Kansas City, MO (SCF 640) 1 68
644 Kansas City, MO (SCF 640) 2 70
646 Kansas City, MO (SCF 640) 7 55

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