O'Fallon, MO ZIP Codes
3 ZIP codes serve O'Fallon, Missouri: 63366, 63368 and 63367. Together they are home to 131,460 residents in 49,363 households. That is more than the 93,801 people counted inside O'Fallon city limits, because these ZIP codes reach past its boundary. Median household income ranges from $100,621 in 63366 to $137,648 in 63367.
O'Fallon city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 93,801 |
| Households | 35,471 |
| Median household income | $110,443 |
| Median home value | $326,200 |
| Median age | 38.4 |
| Median rent | $1,443 |
All 3 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 131,460 |
| Households (sum of ZIP codes) | 49,363 |
| Median household income, range across ZIP codes | $100,621 (63366) to $137,648 (63367) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $117,250 |
| Homeowners | 81.9% |
| Households with kids under 18 | 35.7% |
| Moved in the past year | 10.4% |
| Carrier routes in EDDM2GO's route library | 81 routes, 52,472 homes (3 of 3 ZIP codes) |
Top facts
- Highest median household income in O'Fallon: 63367 ($137,648)
- Most residents: 63366 (54,769 people)
- Highest homeownership: 63366 (82.1% own their home)
- Most households with kids: 63368 (38.4% of households)
- Most new movers: 63367 (13.2% moved in last year)
- Youngest median age: 63368 (38.0 years)
- Highest median home value: 63367 ($409,100)
Every ZIP code in O'Fallon
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 63366 | O Fallon | 54,769 | 20,967 | $100,621 | $304,500 | 82.1% | 33.0% | 8.8% | 33 | 22,640 | 23% of its land; mailing city |
| 63368 | O Fallon | 46,966 | 17,271 | $124,297 | $349,200 | 82.0% | 38.4% | 10.5% | 28 | 19,124 | 55% of its land; mailing city |
| 63367 | Lake Saint Louis | 29,725 | 11,125 | $137,648 | $409,100 | 81.5% | 36.5% | 13.2% | 20 | 13,150 | 13% of its land |
A ZIP code is listed for O'Fallon when at least 10% of its land lies inside O'Fallon city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is O'Fallon. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside O'Fallon.
Counties
- St. Charles County — 14 ZIP codes
Nearby cities sharing these ZIP codes
- Dardenne Prairie — 1 ZIP code
- Lake St. Louis — 1 ZIP code
Price a mailing to O'Fallon ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in O'Fallon, MO?
- 63366, 63368 and 63367. A ZIP code is listed for O'Fallon when at least 10% of its land lies inside O'Fallon city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is O'Fallon.
- What is the population of O'Fallon, MO?
- The Census Bureau counts 93,801 residents inside O'Fallon city limits (ACS 2020–2024). The 3 ZIP codes that serve O'Fallon hold 131,460 residents in all.
- What is the median household income in O'Fallon, MO?
- $110,443 inside O'Fallon city limits, per the Census Bureau. Across its ZIP codes the medians run from $100,621 to $137,648.
- Which O'Fallon ZIP code has the highest median household income?
- 63367, at $137,648, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in O'Fallon, MO?
- For the 3 of 3 ZIP codes in EDDM2GO's stored route library: 81 carrier routes reaching 52,472 residential and 2,438 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.