Union, MO ZIP code
The ZIP code for Union, Missouri is 63084. It is in Franklin County.
- Population in these ZIPs
- 20,708
- Avg. median income
- $76,000population-weighted
- Typical home value
- $259,000population-weighted
- Metro area
- St. Louis, MO-IL
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Union, MO ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 63084 | 20,708 | $75,992 | $259,000 |
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 near Union
- Saint Clair 7 mi
- Beaufort 7 mi
- Washington 8 mi
- Villa Ridge 8 mi
- Gray Summit 11 mi
- Leslie 11 mi
- Robertsville 11 mi
- Stanton 12 mi
- Labadie 12 mi
- Lonedell 14 mi
- Augusta 14 mi
- Catawissa 15 mi
Frequently asked questions
What is the ZIP code for Union, MO?
The ZIP code for Union, MO is 63084.
What county is Union, Missouri in?
Union ZIP codes are in Franklin County.