Sullivan is a city in Moultrie County, Illinois, home to about 4,348 people across 2.8 square miles. Its ZIP code is 61951.
Homes sold for a median of $129 per square foot in the three months ending August 2026, a seller’s market.
Mostly Sullivan; also Allenville
Each card is that ZIP code’s whole market, including any part outside Sullivan. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Sullivan’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)111 miles away |
|---|---|
| Closer regional airport | Decatur Airport (DEC)22 miles away |
| Nearest city of 250,000+ | St. Louis, MO110 miles away |
| Nearest city of 1 million+ | Chicago, IL162 miles away |
Straight-line distances from the center of Sullivan; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Sullivan had 4,413 residents in the 2020 census, up 2% since 2000.
It’s the 359th largest of 1,450 towns in Illinois by population.
Moultrie County grew from 15,224 residents in 1900 to 14,526 in 2020.
Moultrie County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 19°F. About 41.8 inches of rain and melted snow fall in a typical year, with about 13 inches of snow.
Source: NOAA 1991–2020 climate normals, Sullivan 3s, IL weather station (2 miles away).
5,029 jobs at 336 businesses in Moultrie County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
54 doctors and other health care providers list an office in Sullivan.
Nearest hospitals
Providers with an office here
| Primary care doctors | 3 |
|---|---|
| Dentists | 2 |
| Nurse practitioners and physician assistants | 4 |
| Mental health providers | 40 |
| Physical and occupational therapists | 3 |
| Optometrists | 1 |
| Chiropractors | 1 |
| Pharmacies | 6 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (2 nearby)
Grocery stores (1 nearby)
Libraries (1 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Sullivan CUSD 300. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Sullivan Elem SchoolSullivan | Pre-K–5 | 565 | Public | 1.0 mi |
| Sullivan Middle SchoolSullivan | 6–8 | 266 | Public | 0.9 mi |
| Sullivan High SchoolSullivan | 9–12 | 317 | Public | 0.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Allenville.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.