Mercer County · Illinois
ZIP code 61231
- Population
- 4,958
- Median income
- $66,389
- Median home
- $141,200
- Sales tax
- 6.25%
ZCTA residents
Household, past 12 months
Owner-occupied value
Illinois state rate
Quick answer
ZIP 61231 sits in Mercer County, Illinois and is home to 4,958 people. Median household income is $66,389, the median home is worth $141,200 and median gross rent is $772. 70.2% of households own their home, and purchases are taxed at 6.25% (Illinois state rate).
- County
- Mercer County
- State
- Illinois (IL)
- Area codes
- Not published
- Metro area
- Outside covered metros
FIPS 17131
1,396 ZIPs covered
No NANPA match for this ZIP
Rate jurisdiction used for tax
The numbers for 61231
American Community Survey 2019-2023 ACS 5-year estimates for this ZCTA.
- Population
- 4,958ZIP 61231 residents
- Median household income
- $66,389Past 12 months, inflation adjusted
- Median home value
- $141,200Owner-occupied units
- Median gross rent
- $772Rent plus utilities, monthly
- Median age
- 42.6 yrsAll residents
- Homeownership rate
- 70.2%Owner-occupied households
Sales tax in 61231
What a purchase inside this ZIP costs at checkout.
Illinois levies 6.25% statewide, and counties, cities and special districts inside this ZIP can add their own local rate on top. Check the county page for the local component before you quote a price.
Affordability in this ZIP
Derived from the Census medians above — indicative, not an offer.
A rent burden above 30% is the federal threshold for cost-burdened households, and a price-to-income multiple above 4× is generally considered a stretched housing market. The mortgage figure is principal and interest only — taxes, insurance and HOA dues are extra.
How 61231 compares
ZIP 61231 against the median ZIP in Mercer County and across Illinois.
| Measure | ZIP 61231 | County median | State median | vs state |
|---|---|---|---|---|
| Median household income | $66,389 | $71,154 | $72,734 | -9% |
| Median home value | $141,200 | $126,500 | $146,900 | -4% |
| Median gross rent | $772 | $774 | $906 | -15% |
| Population | 4,958 | 960 | 1,856 | +167% |
Medians are computed across the 13 ZIP areas in Mercer County and the 1396 ZIP areas in Illinois.
Statewide rank
Where this ZIP places among all 1396 Illinois ZIP areas.
- Income
- #833
- Home value
- #700
- Population
- #479
richer than 38% of 1,344 state ZIPs
above 48% of 1,335 state ZIPs
larger than 66% of 1,396 state ZIPs
Comparable ZIP codes
Illinois ZIP areas with almost the same household income.
Nearby ZIP codes
Other ZIP codes filed under Mercer County.
ZIP 61231 questions
Common questions about this ZIP code.
- Where is ZIP code 61231?
- ZIP 61231 lies mostly in Mercer County, Illinois. County assignment follows the largest share of land area, so a ZIP straddling a county line is filed under its dominant county.
- What sales tax do I pay in 61231?
- Illinois charges 6.25% statewide, plus any county, city or district rate that applies locally.
- Is 61231 expensive to live in?
- Median rent runs $772 a month, about 14% of median household income, and the median home is worth $141,200 — -4% against the typical Illinois ZIP.
- Is a ZCTA the same as a postal ZIP code?
- Not exactly. The Census builds ZIP Code Tabulation Areas from the ZIP codes of addresses inside each census block, so a ZCTA can differ slightly from the USPS delivery route of the same number, and PO-box-only ZIPs have no ZCTA at all.
Keep going
Related pages for this area.
Sources & transparency
- US Census Bureau, ACS 2019-2023 5-year estimates — 2019-2023 ACS 5-year — population, income, housing
- Census 2020 ZCTA-to-county relationship file — County assignment by largest land-area overlap
- Illinois Department of Revenue — Sales tax rates and local add-ons
Last reviewed December 2024. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.