Total monthly cost of ownership
Cost to Own a Home in O'Fallon, Missouri
A $305,000 home here costs
$2,464per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $1,568. The real number is $896 higher every month — 57% more than the payment most buyers budget for.
Where every dollar goes
Only the first line is a mortgage payment. Change any assumption above and every figure below recalculates.
O'Fallon against St. Charles County and Missouri
| Measure | O'Fallon | St. Charles County |
|---|---|---|
| Median home value | $305,100 | $296,800 |
| Median property tax | $3,501 | $3,340 |
| Effective tax rate | 1.147% | 1.125% |
| Median gross rent | $1,400 | $1,312 |
| Population | 92,697 | 409,830 |
The weather behind that power bill
O'Fallon sits in St. Charles County, which averages a high of 89.5°F in its hottest month and a low of 22.0°F in its coldest, with 39.75" of precipitation a year and 34% of it in a single three-month stretch. That climate drives 1,448 cooling and 4,650 heating degree days, which is what sets the $123 electricity line above.
See the full climate breakdown for St. Charles County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in St. Charles County
Full St. Charles County cost breakdown · Every county in Missouri
Common questions
How much does it cost to own a home in O'Fallon?
A $305,000 home in O'Fallon, Missouri costs approximately $2,464 per month with 20% down at 6.66%. That is $1,568 principal and interest, $292 property tax, $159 homeowners insurance, $191 utilities and $254 set aside for maintenance.
What is the property tax rate in O'Fallon?
O'Fallon has an effective property tax rate of 1.147%, based on a median home value of $305,100 and median real estate taxes of $3,501. That is higher than the St. Charles County average of 1.125%.
What is the average home price in O'Fallon?
The median owner-occupied home value in O'Fallon, Missouri is $305,100, against $296,800 across St. Charles County.
Is it cheaper to rent or buy in O'Fallon?
Median gross rent in O'Fallon is $1,400 a month, against $2,464 to own the median home all in. Renting costs less month to month here, though renting builds no equity.
Sources & methodology
- Median home value, real estate taxes, gross rent and population for O'Fallon — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for Missouri.
- Electricity price — EIA Electric Power Monthly Table 5.6.A.
- Mortgage rate — Freddie Mac PMMS, refreshed weekly.
- Maintenance (1%/yr) and water and sewer ($68/mo) are national estimates. Every assumption above is editable.