Total monthly cost of ownership
Cost to Own a Home in Williamsville, Illinois
A $187,000 home here costs
$1,813per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $961. The real number is $851 higher every month — 89% 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.
Williamsville against Sangamon County and Illinois
| Measure | Williamsville | Sangamon County |
|---|---|---|
| Median home value | $187,000 | $170,300 |
| Median property tax | $4,079 | $3,369 |
| Effective tax rate | 2.181% | 1.978% |
| Median gross rent | $1,055 | $954 |
| Population | 1,519 | 195,217 |
The weather behind that power bill
Williamsville sits in Sangamon County, which averages a high of 85.5°F in its hottest month and a low of 18.6°F in its coldest, with 40.45" of precipitation a year and 36% of it in a single three-month stretch. That climate drives 1,094 cooling and 5,455 heating degree days, which is what sets the $214 electricity line above.
See the full climate breakdown for Sangamon County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in Sangamon County
Full Sangamon County cost breakdown · Every county in Illinois
Common questions
How much does it cost to own a home in Williamsville?
A $187,000 home in Williamsville, Illinois costs approximately $1,813 per month with 20% down at 6.66%. That is $961 principal and interest, $340 property tax, $73 homeowners insurance, $282 utilities and $156 set aside for maintenance.
What is the property tax rate in Williamsville?
Williamsville has an effective property tax rate of 2.181%, based on a median home value of $187,000 and median real estate taxes of $4,079. That is higher than the Sangamon County average of 1.978%.
What is the average home price in Williamsville?
The median owner-occupied home value in Williamsville, Illinois is $187,000, against $170,300 across Sangamon County.
Is it cheaper to rent or buy in Williamsville?
Median gross rent in Williamsville is $1,055 a month, against $1,813 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 Williamsville — US Census Bureau, American Community Survey ACS 2023 5-Year, place-level tables.
- Homeowners insurance — NAIC average premium for Illinois.
- 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.