PlainZIP

O Fallon, MO

Single-footprint Census roll-up for O Fallon, MO: 2 USPS ZIPs, population 89,535. Open the primary ZIP for household income, housing tenure, and commute from ACS 2023 5-Year Estimates.

U.S. Census Bureau, SimpleMaps US ZIP Code Database, delivery-area ZIP coverage

ACS city ledger plate

Sheet O-FALLON-MO · O Fallon, MO 2 ZIPs · 89,535 pop · #2820/25278 · St. Charles County

INC-TOP · RANK-TOP · PHOTO-FINISH · BOOK-FEW · OWN-MID · POP-SMALL · SPREAD-TIGHT · HOME-MID

  • INC-TOP $112,459
  • RANK-TOP #2820/25278
  • PHOTO-FINISH ≈ Wentzville
  • BOOK-FEW 2 ZIPs
  • OWN-MID 82% owners
  • POP-SMALL 89,535
  • SPREAD-TIGHT 63366→63368
  • HOME-MID $326,850

Nearest income peer: Wentzville, MO ( $260 income $)

Instrument codes from this city’s ACS household income, national rank, county-peer gap, ZIP book, owner tenure, population scale, intra-city income spread, and home-value band, not a moving recommendation.

Income neighbourhood around O Fallon

Lowest/highest poles plus county-sharing cities nearest O Fallon on average ZIP median household income. Full ladder: /cities.

median HH income

What this shows County-sharing peers only, not the full US city board. Open a near peer when the gap is small; open the poles when the mosaic is wide.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2026-08-25

National city placement

According to ACS 5-Year Estimates, O Fallon, MO sits among US cities with an upper-quartile household income, on a small-city population base, across a handful of delivery areas.

Top 11%
household income vs 25,278 US cities
89,535
city population (Census)
2
USPS ZIP codes covered
$112,459
avg ZIP median income

Income percentile ranks this city's average ZIP median household income against 25,278 US cities with ACS income on at least one ZIP. Scale and ZIP-spread words come from Census population and USPS ZIP coverage.

High-income footprint on only 2 ZIPs: the city page and the ZIP page nearly coincide. Headline income $112,459 and home value $326,850 should be read as near-neighborhood numbers ; bachelor's attainment averages 42.1%.

Owner-occupancy sits in a mixed band (82.0%) - check the ZIP page's tenure split before treating O Fallon as a pure owner town.

Within Missouri, Wentzville is the closest lower-income city and Kearney the closest higher-income city by average ZIP household income. Their 1 and 1 ZIP footprints are the immediate statewide comparison set for O Fallon.

Within-city ZIP comparison

Where the ZIP codes inside O Fallon differ

The published income range is comparatively compact across the ZIPs in O Fallon: $100,621 in ZIP 63366 to $124,297 in 63368. The city average is therefore a more representative summary here, though each ZIP page still carries its own housing and demographic record.

Income high-to-low ratio
1.2×

63366 to 63368

Home-value high-to-low ratio
1.1×

63366 to 63368

Poverty-rate spread
3.2 points

63368 to 63366

Derived from the published ACS 2023 ZIP-level records shown on this site. A high-to-low ratio compares the highest and lowest available ZIP values; it is not a score or forecast.

Population concentration

Lead ZIP 63366 skews compact O Fallon

In this 2-ZIP cluster, 63366 covers about 52% of O Fallon's 89,535 residents. City averages lean toward that lead; open a thinner sibling ZIP for the contrast the mean hides.

Census ZBP business roll-up

Balanced ZBP roll-up inside compact O Fallon

Citywide ZBP: 2,023 establishments, 35,148 employees , annual payroll $2,626,942k (~23 establishments per 1,000 residents) across 2 of 2 ZIPs. Peak business ZIP 63366 (1,192 units) ; leading NAICS Health care and social assistance (288) · also Retail trade · Construction .

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ZIP Codes in O Fallon, MO

These ZIP codes sit in St. Charles County, which covers 13 ZIP codes in all; 2 of them fall in O Fallon. See the St. Charles County roll-up →

O Fallon lands mid-pack among the 9 cities sharing St. Charles County: Lake Saint Louis, Foristell and Defiance earn more and Saint Charles, Saint Peters and Portage Des Sioux earn less. Defiance marks the far end of that range at $170,598, 52% above O Fallon.

Side-by-side: Compare 63366 vs 63368 →

ZIP Code Population Median income Establishments Density
63366 46,175 $100,621 1,192 259
63368 43,360 $124,297 831 1,016
How we build city roll-ups · Guide: reading ZIP code data · BLS wages

O Fallon roll-ups here are for informational purposes only and do not constitute financial or relocation advice. ACS and Census ZBP figures are estimates; confirm the current table against Census before a money or move decision involving O Fallon, .