Collinsville IL Real Estate: Homes, Schools, and Local Guide

Collinsville is the largest community in this guide at about 24,031 people, and the one with the best interstate access by a wide margin. It is also split across two counties, which is the single most practically important thing a buyer or seller here can know and the thing almost nobody mentions.

About Collinsville, Illinois

Collinsville has a population of about 24,031 across 15.4 square miles, with 11,644 housing units. Owner-occupancy is 66.0% and single-unit structures are 72.0% of the stock. It is a mature, largely built-out town rather than a new-construction market.

Cahokia Mounds State Historic Site is here at 30 Ramey Street: a UNESCO World Heritage Site designated in 1982, a National Historic Landmark since 1965, and the largest pre-Columbian site north of Mexico. The original city covered over 4,000 acres and held roughly 20,000 people around AD 1100, larger than London at the time.

Collinsville IL Real Estate Market Overview

Collinsville is the busiest market on this list, with 341 closed sales, and the bulk of it trades under $250,000.

What actually sold in Collinsville over the past 12 months:

• 341 homes closed between October 2025 and September 2026
• The median sale landed in the $200,000 to $250,000 range
• 48% sold for under $200,000
• 45% sold between $200,000 and $400,000
• 7% sold for more than $400,000

Source: MARIS MLS closed residential sales, October 2025 through September 2026. Single family, condominium, townhouse and villa only; rentals excluded. Pulled September 22, 2026.

Buying a Home in Collinsville, IL

Collinsville’s median year built is 1971, thirteen to fourteen years older than Mascoutah or Lebanon. Roughly 23% of the housing predates 1950 and only about 4.4% was built in 2010 or later. Pre-1940 is the single largest bucket at 16.9%.

What to weigh before you make an offer in Collinsville:

• Confirm which county the parcel is in. Collinsville spans Madison and St. Clair counties, which means two different assessors, two different tax bill cycles and two different recorder’s offices depending on which side of the line the house sits. This is the most commonly missed fact in town.
• Most of the city is one unit district, but not all of it. A small portion on the northeast side is in Triad District 2 instead. See below.
• Expect older construction. With a median year built of 1971 and nearly a quarter of homes predating 1950, inspections matter more here than in the newer suburbs.
• New construction is genuinely scarce, at about 4.4% of stock built in 2010 or later and 0.2% in 2020 or later.
• Ask about the flood map on the western side. The city’s western edge descends toward the American Bottom. We did not obtain a FEMA map, so we are not characterizing any specific zone. Pull the FEMA panel for the parcel.

Schools in Collinsville, IL

The county line does not split the schools, which surprises people. Collinsville Community Unit School District 10 is a single K-12 unit district spanning both St. Clair and Madison counties, serving Collinsville, Caseyville, Fairmont City and Maryville from its office at 201 West Clay Street.

District 10 runs an unusual four-tier structure that catches new families out: elementary school, then Dorris Intermediate School, then Collinsville Middle School, then Collinsville High School. Most Metro East districts have three tiers. The district also operates the Collinsville Area Vocational Center.

District 10 elementary buildings:

• Caseyville, Hollywood Heights, Jefferson, Kreitner, Maryville, Renfro, Summit, Twin Echo and Webster

The split that does exist is on the northeast side. Triad Community Unit School District 2, based in Troy, serves Troy, St. Jacob and Marine plus small portions of Collinsville, Maryville, Glen Carbon, Edwardsville and Highland. Those students attend Triad Middle and Triad High School rather than Collinsville Middle and Collinsville High. We could not obtain the boundary polygons, so we cannot tell you which streets, only that the exception is real.

District 10 assigns elementary students by address, not by choice, and publishes an address lookup tool along with boundary maps. For any specific listing, run the address through the district’s tool rather than inferring from the mailing address.

Sources: Collinsville CUSD 10 district site and boundary maps; Triad CUSD 2 service area. School assignment must be confirmed by parcel address.

Commuting from Collinsville

Collinsville has the strongest interstate access of any community in this guide, with three interstates touching the city.

• Average one-way commute: 24.2 minutes, slightly below the St. Louis metro figure of 24.9 and well below the Illinois figure of 27.8
• Drive alone to work: 74.7% of workers, with 12.7% working from home
• Interstates: I-55 and I-70 run concurrently across the north side at exits 9 through 15, and I-255 runs along the west side at exits 24 and 26
• State routes: Illinois Route 159 runs north to south through the center of the city, and Illinois Route 157 crosses the western portion
• Distance: approximately 14 miles east of St. Louis
• No MetroLink station in Collinsville. Commuters drive to a station or drive into the city

Commute figures: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.

Collinsville Lifestyle and Community

• Cahokia Mounds State Historic Site, 30 Ramey Street: a UNESCO World Heritage Site with Monks Mound, the largest prehistoric earthwork in the Americas. Grounds open daily dawn to dusk
• Willoughby Heritage Farm and Conservation Reserve, 631 Willoughby Lane: 40 acres of bluff-line prairie and woodland with preserved barns, a 1930s Craftsman farm house and farm animals
• The Brooks Catsup Bottle water tower, 170 feet tall, billed as the world’s largest catsup bottle and listed on the National Register
• Splash City Family Waterpark, Arlington Greens Golf Course and the Collinsville Sports Complex, along with Woodland Park, Glidden Park and the Mutts on Main dog park
• Uptown Collinsville, the historic commercial district, with Route 66 murals and an oversized Route 66 shield
• Italian Fest, held annually since 1983, and the International Horseradish Festival
• Collinsville Memorial Library Center, 408 West Main Street, part of the Mississippi Valley Library District

Source: City of Collinsville and Collinsville Area Recreation District pages; Cahokia Mounds State Historic Site. Note that recreation here is run by two separate bodies, the City department and the CARD park district.

Collinsville IL Real Estate: Common Questions

What county is Collinsville, IL in?

Both Madison and St. Clair. Collinsville spans the county line, which means the assessor, the tax bill cycle and the recorder’s office all depend on which side of the line a specific parcel falls on. Always confirm the county for the actual property rather than assuming from the city name.

What school district is Collinsville, IL in?

Most of the city is in Collinsville Community Unit School District 10, a single K-12 unit district that spans both counties and also serves Caseyville, Fairmont City and Maryville. The county line does not split the district. However, a small portion of the Collinsville area on the northeast side is in Triad Community Unit School District 2 instead, whose students attend Triad Middle and Triad High. Run the address through District 10’s lookup tool before making an offer.

How old are the homes in Collinsville, IL?

Older than most of the surrounding towns. The median year built is 1971, roughly 23% of housing predates 1950, and pre-1940 is the single largest bucket at 16.9%. Only about 4.4% was built in 2010 or later. (Source: American Community Survey 2020-2024.)

How long is the commute from Collinsville to St. Louis?

The average one-way commute is 24.2 minutes, slightly below the St. Louis metro average of 24.9 minutes, with 74.7% driving alone. The city is about 14 miles east of St. Louis and has I-55, I-70 and I-255 access. (Source: American Community Survey 2020-2024.)

What is Cahokia Mounds?

A UNESCO World Heritage Site in Collinsville at 30 Ramey Street, designated in 1982 and a National Historic Landmark since 1965. It is the largest pre-Columbian site north of Mexico. The original city spread over 4,000 acres with about 120 earthen mounds and a population near 20,000 around AD 1100. Illinois protects roughly 2,200 acres of the central portion.

Work With Single Tree Team in Collinsville

Single Tree Team is Craig Ziegel, licensed in Illinois and Missouri since 2011 and brokered by eXp Realty. In Collinsville the two questions that change a transaction are which county the parcel sits in and which school district serves it, and neither can be answered from the mailing address.

Ready to make a move in Collinsville? Call or text us at (223) 262-0988 or use the contact form below to get started with a free home valuation or buyer consultation.

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