Total monthly cost of ownership
Cost to Own a Home in Somonauk, Illinois
A $222,000 home here costs
$2,163per month, all in — with 20% down at today's 6.66% 30-year fixed rate.
A standard mortgage calculator would have told you $1,141. The real number is $1,022 higher every month — 90% 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.
Somonauk against LaSalle County and Illinois
| Measure | Somonauk | LaSalle County |
|---|---|---|
| Median home value | $221,500 | $154,900 |
| Median property tax | $5,600 | $3,336 |
| Effective tax rate | 2.528% | 2.154% |
| Median gross rent | $883 | $906 |
| Population | 1,592 | 109,049 |
Somonauk extends across 2 counties. Figures here use LaSalle County, where most of its housing sits.
The weather behind that power bill
Somonauk sits in LaSalle County, which averages a high of 82.9°F in its hottest month and a low of 15.2°F in its coldest, with 36.19" of precipitation a year and 35% of it in a single three-month stretch. That climate drives 865 cooling and 6,211 heating degree days, which is what sets the $214 electricity line above.
See the full climate breakdown for LaSalle County — month by month temperatures, rainy season timing, snowfall and heating and cooling costs.
Other cities in LaSalle County
Full LaSalle County cost breakdown · Every county in Illinois
Common questions
How much does it cost to own a home in Somonauk?
A $222,000 home in Somonauk, Illinois costs approximately $2,163 per month with 20% down at 6.66%. That is $1,141 principal and interest, $468 property tax, $87 homeowners insurance, $282 utilities and $185 set aside for maintenance.
What is the property tax rate in Somonauk?
Somonauk has an effective property tax rate of 2.528%, based on a median home value of $221,500 and median real estate taxes of $5,600. That is higher than the LaSalle County average of 2.154%.
What is the average home price in Somonauk?
The median owner-occupied home value in Somonauk, Illinois is $221,500, against $154,900 across LaSalle County.
Is it cheaper to rent or buy in Somonauk?
Median gross rent in Somonauk is $883 a month, against $2,163 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 Somonauk — 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.