61856 ZIP Code — Monticello, IL

Piatt County, Illinois

ZIP code 61856 is located in Monticello, Illinois, within Piatt County. It covers approximately 107.92 square miles and serves a population of 8,315 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 217.

About ZIP code 61856

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $208,400. Owner-occupancy is high at 83%, well above the national average.

Median household income is $86,269. The poverty rate of 7% is below the national average. 40% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 24 minutes is near the national average.

Educational attainment is near the national average, with 39% of residents holding a bachelor's degree or higher.

Overall, ZIP code 61856 reflects a community defined by high homeownership and a significant Social Security-dependent population.

8,315

population

107.92

sq mi land

Standard

ZIP type

Central (CT)

timezone

61856 ZIP code map

Cities in ZIP code 61856

Below are the cities the US Postal Service accepts for ZIP code 61856. Using any city not on this list may result in mail delivery delays.

City	Status
Monticello	Acceptable
Monticello	Preferred

Nearby ZIP codes

61884 White Heath (6.2 mi) 61839 De Land (7.8 mi) 61830 Cisco (8.5 mi) 61813 Bement (8.9 mi) 61875 Seymour (9.7 mi) 61851 Ivesdale (9.9 mi) 61882 Weldon (10 mi) 61854 Mansfield (11 mi) 61872 Sadorus (12.9 mi) 61818 Cerro Gordo (13 mi) 61929 Hammond (14.7 mi) 62501 Argenta (15.3 mi)

Demographics updated 05/2026

Population
Total population	8,315
Population density	77 / sq mi
State FIPS	17
County FIPS	147

Geography
Land area	107.92 sq mi
Water area	0.12 sq mi
Latitude	40.0365
Longitude	-88.5779
Timezone	Central (CT)
Area code	217

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	33.1%	35.4%	37.2%
$50k – $100k	27.1%	32.0%	29.6%
$100k – $200k	36.0%	27.9%	24.4%
Over $200k	3.7%	4.6%	8.8%

Demographics & statistics

8,315

Population

People per sq mi

40.3

Median age

$86,269

Median household income

$42,235

Per capita income

$208,400

Median home value

$991

Median monthly rent

83.4%

Home ownership

6.6%

Poverty rate

3.1%

Unemployment

3,005

Housing units

38.8%

Bachelor's or higher

Age distribution

Male Female

255

Under 5

253

365

5–9

362

199

10–14

197

213

15–19

212

172

20–24

170

541

25–34

537

501

35–44

498

359

45–54

357

306

55–59

304

357

60–64

354

509

65–74

506

230

75–84

229

165

85+

164

← Male

Female →

Age summary

Group	Count	%
Under 18	1,922	23.1%
18 and over	6,393	76.9%
65 and over	1,803	21.7%
Median age	40.3 years

Race & ethnicity

White 95.9%

Two or more races 2.4%

Black or African American 1%

Hispanic or Latino 0.7%

Group	Count	%
White	8,030	95.9%
Two or more races	200	2.4%
Black or African American	84	1%
Hispanic or Latino	55	0.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	33.1%	35.4%	37.2%
$50k – $100k	27.1%	32.0%	29.6%
$100k – $200k	36.0%	27.9%	24.4%
Over $200k	3.7%	4.6%	8.8%

Under $10k 4.5%

$10k–$15k 1.9%

$15k–$25k 6.5%

$25k–$35k 5.0%

$35k–$50k 7.6%

$50k–$75k 19.8%

$75k–$100k 11.6%

$100k–$150k 25.8%

$150k–$200k 9.8%

$200k+ 7.5%

Range	% of households
Under $10k	4.5%
$10k–$15k	1.9%
$15k–$25k	6.5%
$25k–$35k	5.0%
$35k–$50k	7.6%
$50k–$75k	19.8%
$75k–$100k	11.6%
$100k–$150k	25.8%
$150k–$200k	9.8%
$200k+	7.5%
Median income	$86,269

Housing

Home values

Under $50k 1.7%

$50k–$100k 2.9%

$100k–$150k 17.6%

$150k–$200k 24.5%

$200k–$300k 29.8%

$300k–$500k 20.5%

$500k–$1M 2.6%

$1M+ 0.3%

Housing overview

Metric	Value
Median home value	$208,400
Median rent / month	$991
Owner occupied	83.4%
Renter occupied	16.6%
Vacant	4.9%
Single-family detached	82.6%
Large apartment buildings	4.4%
Mobile homes	1.5%
Median rooms	6.6
Avg household size (owned)	2.59

Year built

Era	%
2020 or later	0.0%
2010–2019	6.3%
2000–2009	16.7%
1990–1999	12.9%
1980–1989	9.5%
1970–1979	16.7%
1960–1969	12.9%
1950–1959	5.9%
1940–1949	3.5%
1939 or earlier	15.5%

Bedrooms

Size	% of units
No bedroom (studio)	2.0%
1 bedroom	8.7%
2 bedrooms	25.1%
3 bedrooms	35.3%
4 bedrooms	24.4%
5+ bedrooms	4.5%

Vehicles per household

Vehicles	% of households
No vehicle	2.4%
1 vehicle	25.8%
2 vehicles	45.2%
3 or more	26.6%

Heating fuel

Fuel type	%
Utility gas	61.4%
Electricity	28.2%
Propane / LP gas	8.2%
Fuel oil	1.0%
Wood	0.6%

Households & families

Household type	Count	%
Married-couple family	1,952	57.5%
Cohabiting couple	152	4.5%
Male householder, no spouse	566	16.7%
Female householder, no spouse	722	21.3%
Households with children under 18	942	27.8%
Households with seniors (65+)	1,250	36.9%
Average household size	2.43

Marital status

Status	Male	Female
Never married	23.9%	17.5%
Married	62.5%	59.3%
Separated	0.7%	0.6%
Widowed	3.4%	9.4%
Divorced	9.5%	13.2%

Education

Less than 9th grade 2.1%

Some HS, no diploma 5.2%

HS graduate 24.9%

Some college, no degree 17.0%

Associate's degree 12.1%

Bachelor's degree 24.7%

Graduate / professional 14.1%

Metric	%
HS diploma or higher	92.7%
Bachelor's or higher	38.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	225	13.2%
Kindergarten	105	6.2%
Elementary school	833	49.0%
High school	299	17.6%
College / grad school	238	14.0%

Employment

Industry of employment

Education & healthcare 41.0%

Manufacturing 7.9%

Finance & real estate 7.9%

Professional & management 7.1%

Retail trade 6.4%

Transportation & utilities 5.9%

Construction 5.3%

Agriculture & mining 4.6%

Arts, food & hospitality 4.3%

Wholesale trade 3.4%

Public administration 2.9%

Other services 2.0%

Information 1.3%

Occupation

Category	%
Management, business & arts	46.4%
Service	13.4%
Sales & office	20.6%
Natural resources & construction	7.7%
Production & transportation	11.9%

Employment type

Type	%
Private sector	70.4%
Government	23.6%
Self-employed	6.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	87.1%
Carpool	4.2%
Public transit	0.5%
Walk	0.5%
Work from home	7.7%
Other means	0.0%
Avg commute (minutes)	23.6

Poverty

All people 6.6%

Under 18 years 8.4%

18 and over 6.1%

Married-couple families 2.0%

Female-led households 22.1%

Income support

Source	% of households
Social Security	39.7%
Retirement income	37.7%
Supplemental Security	1.4%
Cash public assistance	1.2%
Food stamps / SNAP	3.4%

Health indicators

Condition	%
Obesity	33.0%
High blood pressure	32.3%
High cholesterol	34.9%
Diabetes	9.1%
Heart disease	6.2%
Stroke	2.8%
Asthma	9.1%
Arthritis	26.7%
Kidney disease	2.7%
Pulmonary disease	6.2%
Cancer	7.7%

Behavior / access	%
Smoking	14.9%
Binge drinking	15.4%
No physical activity	20.8%
Less than 7 hrs sleep	29.7%
Depression	16.8%
Fair or poor health	11.4%
Poor mental health	11.5%
Poor physical health	8.7%
No health insurance	8.4%
Visited doctor (checkup)	77.8%
Visited dentist	69.8%
Cholesterol screening	91.9%
Teeth loss	10.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	286	4.5%

Disability	%
Any disability	11.0%
Under 18	1.5%
18–64 years	9.9%
65 and over	24.3%

Health insurance coverage

Type	%
Private insurance	81.9%
Public insurance	31.5%
No insurance	2.4%
Uninsured under 19	1.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,807	93.9%
Spanish	36	0.5%
Other Indo-European	36	0.5%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	8,294	99.7%
Born in same state	8,249	99.2%
Born in different state	6,816	82.0%
Foreign born	45	0.5%
Naturalized citizen	21	0.3%
Not a US citizen	21	100.0%

Ancestry

Ancestry	Count	%
French	1,343	16.2%
Italian	1,162	14%
Arab	609	7.3%
English	137	1.6%

Ancestry	Count	%
Polish	132	1.6%
Irish	63	0.8%
German	19	0.2%

Technology access

Metric	% of households
Computer access	40.8%
Internet access	93.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 61856

What city is ZIP code 61856 in?

ZIP code 61856 is primarily assigned to Monticello, Illinois.

What county is ZIP code 61856 in?

ZIP code 61856 falls within Piatt County, Illinois.

Is ZIP code 61856 mostly owner-occupied?

83% of occupied units in ZIP code 61856 are owner-occupied, well above the national average.

Does ZIP code 61856 have a large retiree population?

40% of households in ZIP code 61856 receive Social Security income, suggesting a significant retiree or disability population.

What is the population of ZIP code 61856?

ZIP code 61856 has an estimated population of 8,315 residents, with a density of 77 people per square mile.

What is the typical home value in ZIP code 61856?

The median home value in ZIP code 61856 is $208,400.

What timezone is ZIP code 61856 in?

ZIP code 61856 observes the CST timezone.