ZIP Code 63366 — O'Fallon city, MO Demographics & Data

ZIP code 63366 covers O'Fallon, MO in St. Charles County with a population of about 54,449.

At a glance, the area shows median age of 39.2 (near the U.S. median).

It sits in telephone area code 636; U.S. House district MO-3; the ST. LOUIS media market.

Median household income in ZIP 63366 is about $98,237 — about 31% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 5.9%; unemployment rate near 3.3%; 34.3% of adults with a bachelor’s degree or higher (roughly in line with the national share (33.7%)).

Labor and commute patterns include leading industry context around Manufacturing, Healthcare, and Retail trade; about 13.7% of workers reporting work-from-home (about 1.5 points below the U.S. share (15.2%)); a mean commute of about 180.0 minutes (U.S. average near 26.8).

Median home value is about $283,900 — about 18% below the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $1,066 (about 8% below the U.S. median rent ($1,163)), and owner-occupancy near 81.1% (about 15.7 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 63366 in O'Fallon, MO, a household would need roughly $78,000 in annual income under a 20% down, 30-year loan at 6.8% (illustrative), keeping housing costs near 28% of income. Estimated monthly PITI is about $1,824. That sits below the local median household income ($98,237), suggesting the typical household income is closer to a workable buy-in level under these assumptions. Rates, taxes, insurance, and HOA fees vary — treat this as a planning estimate, not a lender quote.

FEMA’s National Risk Index rates natural-hazard risk for O'Fallon city, MO as Relatively Moderate (composite score 92.6), which is among the highest nationally. The strongest component scores on US5 are flood (94.2) and wildfire (58.8). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.

Climate normals for O'Fallon city, MO show little to no average snow and around 42.3 inches of annual precipitation.

IRS migration statistics show a net inflow of about 2,461 for ZIP 63366 (O'Fallon city, MO) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.