Andrew County, Missouri ZIP codes
10 ZIP codes are in Andrew County, plus 7 that cross in from neighboring counties. It's part of the St. Joseph, MO-KS metro area.
- ZIP codes
- 10
- Population in these ZIPs
- 27,458
- Avg. median income
- $72,500population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Andrew County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 64421 | Amazonia | 817 | $53,125 | $184,600 |
| 64427 | Bolckow | 582 | $62,917 | $281,700 |
| 64436 | Cosby | 873 | $113,500 | $341,700 |
| 64449 | Fillmore | 491 | $71,667 | $220,500 |
| 64459 | Helena | 507 | $78,808 | $260,200 |
| 64480 | Rea | 329 | $115,781 | $266,700 |
| 64483 | Rosendale | 591 | $73,750 | $252,300 |
| 64485 | Savannah | 7,998 | $67,929 | $267,800 |
| 64494 | Union Star | 1,163 | $65,511 | $216,600 |
| 64505 | Saint Joseph | 14,107 | $73,298 | $220,300 |
ZIP codes partly in Andrew County
These ZIP codes are mostly in a neighboring county but cover part of Andrew County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 64423 | Barnard | Nodaway County | 777 | $58,854 | $177,300 |
| 64430 | Clarksdale | DeKalb County | 823 | $75,577 | $267,400 |
| 64455 | Graham | Nodaway County | 292 | $53,864 | $102,300 |
| 64457 | Guilford | Nodaway County | 308 | $62,250 | $329,700 |
| 64463 | King City | Gentry County | 1,349 | $59,219 | $160,300 |
| 64506 | Saint Joseph | Buchanan County | 21,461 | $65,573 | $278,600 |
| 64507 | Saint Joseph | Buchanan County | 13,991 | $61,158 | $167,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Andrew County
Nearby counties
Frequently asked questions
How many ZIP codes are in Andrew County, Missouri?
10 ZIP codes are mainly in Andrew County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Andrew County?
ZIP codes in Andrew County use the city names Amazonia, Bolckow, Cosby, Fillmore, Helena, Rea, Rosendale, Saint Joseph, Savannah and Union Star.
What metro area is Andrew County in?
Andrew County is part of the St. Joseph, MO-KS metropolitan statistical area.