Residential delivery area · Illinois
ZIP Code 61856: Monticello, IL
ZIP code 61856 uses the postal name Monticello, Illinois and lies entirely in Piatt County (Census 2020 ZIP-county file). About 8,200 people live there (Census Bureau, ACS 2020-2024). Median household income is $103,559 (Census Bureau, ACS 2020-2024). By Census place, 4% of its land lies in Monticello; 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Monticello · its only residential ZIP
- County
- Piatt County
- Census places
- Monticello
- Metro area
- Champaign-Urbana, IL
- House districts
- IL-13 (71%), IL-15 (29%) 119th Congress, by share of land
- State
- Illinois
- Time zone
- Central
- Land area
- 107.9 sq mi · 76 people per sq mi
Where is ZIP code 61856?
61856 centers on 40.029°, -88.584° and covers 107.9 square miles of land plus 0.1 of water. It borders 9 ZIP codes: 61884, 61839, 61830, 61813, 61855, 61851, 61882, 61818, 61854.
The map draws ZIP code areas only. For the streets inside 61856, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 61856 compare with the rest of Piatt County?
| Measure | 61856 | In Piatt County | In IL |
|---|---|---|---|
| People (ACS 2020-2024) | 8,226 | 2nd of 16 | 400th of 1,396 |
| Median household income | $104k | 2nd of 7 | 170th of 797 |
| Median home value | $231k | 2nd of 7 | 317th of 842 |
Its median household income is higher than in 83% of U.S. residential ZIP codes, and it is denser than 49% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 61856?
The 2020 Census counted 7,933 people in 61856; the ACS, which samples households over 2020-2024, estimates 8,226. Between the 2010 and 2020 censuses its population grew 6.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 8,226
- 2020 Census count
- 7,933+6.7% since 2010 (7,433)
- Households
- 3,400
- Median age
- 42.9
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 61856?
Of the 8,226 people the ACS estimates in 61856, 21.0% are under 18 and 21.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (94.9%).
- Under 1821.0%
- 18 to 6457.2%
- 65 and older21.8%
- White, not Hispanic94.9%
- Black, not Hispanic2.1%
- Hispanic or Latino1.8%
- Asian, not Hispanic0.7%
- Other or two or more0.4%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 61856 earn?
Median household income is $103,559 (ACS 2020-2024), the 2nd highest of the 7 ranked ZIP codes in Piatt County. It is not measurably different from 2015-2019 ($95,143 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $103,559±$12,723
- Income per person
- $51,286
- Below the poverty line
- 4.5%
- Unemployed (of the labor force)
- 0.7%
- Adults 25+ with a bachelor's degree
- 42.6%
- Adjusted gross income per tax return, 2022
- $99,4193,960 returns; wages 63% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 61856?
FHFA's house price index for 61856, built from repeat sales and appraisals of the same homes, rose 60% from 2015 to 2025 and rose 48% from 2020 to 2025, and moved +6.5% in 2025.
- Median home value (owners' estimate)
- $230,900
- Median gross rent
- $1,398
- Homes owned by their occupants
- 85.7%
- Housing units
- 3,546
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 61856?
191 business establishments had a location in this ZIP code in 2023, 6 more than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade29
- Construction25
- Other services (except public administration)21
- Professional, scientific, and technical services19
- Accommodation and food services18
- Health care and social assistance16
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 61856?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 61884 | White Heath | 973 | $106k | 6.5 mi |
| 61839 | De Land | 558 | $56k | 7.6 mi |
| 61830 | Cisco | 510 | $67k | 7.9 mi |
| 61813 | Bement | 2,043 | $84k | 8.2 mi |
| 61855 | Milmine | 24 | – | 8.3 mi |
| 61851 | Ivesdale | 279 | $59k | 9.0 mi |
| 61882 | Weldon | 777 | $80k | 10.5 mi |
| 61818 | Cerro Gordo | 1,560 | $84k | 12.1 mi |
| 61854 | Mansfield | 1,299 | $87k | 12.1 mi |
| 61875 | Seymour | 846 | $119k | 10.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.