Caldwell County, MO ZIP codes
There are 7 ZIP codes in Caldwell County, MO, in 7 towns, from 64624 to 64671. The largest are 64644 (Hamilton), 64671 (Polo) and 64624 (Braymer). 1 more crosses into it from a neighbouring county: 64429.
The county seat is Kingston.
- ZIP codes
- 7
- Partly in it
- 1 more
- Towns
- 7
- County seat
- Kingston
- County FIPS
29025- State
- Missouri
- Population
- 8,927
- Median household income
- $64,806
- Land area
- 426 sq mi
- Metro area
- Kansas City
Caldwell County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
ZIP codes partly in Caldwell County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Caldwell County.
- 64429 Cameron · mostly in DeKalb County
Map of Caldwell County ZIP codes
The ZIP codes of Caldwell County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Caldwell County in numbers
About 8,927 people live in Caldwell County, in 3,769 households, the 90th most populous of Missouri's 115 counties. The median household income is $64,806 a year, 8% below the Missouri median of $70,702 (US: $80,734). The median owner-occupied home is valued at $166,500 (28% below the Missouri median), and median gross rent is $640 a month. The median age is 43.2; 19.9% of adults 25 and over hold a bachelor's degree or higher (32.4% across Missouri); the average commute takes 32 minutes.
| Population | 8,927 |
|---|---|
| Households | 3,769 |
| Median age | 43.2 |
| Median household income | $64,806 |
| Median home value | $166,500 |
| Median gross rent | $640 |
| Bachelor's degree or higher | 19.9% |
| Mean commute | 32.4 min |
| Population density | 21 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Caldwell County
| Town | ZIP codes | Population |
|---|---|---|
| Hamilton | 1 | 1,755 |
| Braymer | 1 | 795 |
| Kidder | 1 | 501 |
| Breckenridge | 1 | 485 |
| Polo | 1 | 480 |
| Kingston | 1 | 271 |
| Cowgill | 1 | 176 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Caldwell County.
- Clay County (22)
- Ray County (7)
- Clinton County (6)
- Livingston County (7)
- DeKalb County (6)
- Daviess County (8)
- Carroll County (8)
Not sure you are in Caldwell County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Caldwell County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
64624 | Braymer , MO | Standard | 1,489 | $58,095 | $95,500 |
64625 | Breckenridge , MO | Standard | 738 | $35,000 | $64,300 |
64637 | Cowgill , MO | Standard | 492 | $56,944 | $125,000 |
64644 | Hamilton , MO | Standard | 2,923 | $74,408 | $193,600 |
64649 | Kidder , MO | Standard | 814 | $67,216 | $228,100 |
64650 | Kingston , MO | Standard | 665 | $45,441 | $203,100 |
64671 | Polo , MO | Standard | 1,986 | $75,455 | $173,200 |
Cite this page
zipcodes.pro. “Caldwell County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/mo/county/caldwell
Underlying data is public domain or openly licensed — sources, vintages and licences.