ZIP Code 63303 — St. Charles city, MO Demographics & Data

ZIP code 63303 covers St. Charles, MO in St. Charles County with a population of about 46,627.

At a glance, the area shows median age of 41.2 versus a U.S. median of about 38.9.

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

Median household income in ZIP 63303 is about $98,031 — about 30% above the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 4.5%; unemployment rate near 1.8%; 50.1% of adults with a bachelor’s degree or higher (about 16.4 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Manufacturing, Healthcare, and Professional services; about 17.0% of workers reporting work-from-home (about 1.8 points above 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 $301,700 — about 13% below the U.S. median home value ($348,079).

Housing tenure and rents show median gross rent around $1,177 (about even with the U.S. median rent ($1,163)), and owner-occupancy near 75.2% (about 9.8 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 63303 in St. Charles, MO, a household would need roughly $83,000 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 $1,938. That sits below the local median household income ($98,031), 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 St. Charles 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 St. Charles 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 2,108 for ZIP 63303 (St. Charles 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.