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Illinois legalized adult-use cannabis on January 1, 2020 under the Cannabis Regulation and Tax Act (CRTA), making it one of the most deliberately structured market rollouts in U.S. history. The state launched with a small initial cohort of converted medical dispensaries — just 55 stores statewide on day one — and spent the next four years issuing new licenses through a combination of lottery draws and social equity priority tracks. The result was a deliberate scarcity that kept Illinois cannabis prices among the highest in any legal market through 2022, followed by a gradual normalization as new stores opened and wholesale prices began to compress.

We track 23 dispensaries across two Illinois zones: Chicago city proper (15 stores, two each in Logan Square and River North, one in the South Loop, with the rest on the north and west sides and in South Shore) and the suburbs (8 stores, exactly one each in Oak Park, Berwyn, Morton Grove, Chicago Ridge, Calumet City, Tinley Park, Matteson and St. Charles). Illinois adult-use cannabis is taxed at a 10% state excise for flower and products at or below 35% THC, 25% for products above that threshold, and 20% for edibles and other infused products, layered with the 6.25% state rate, Cook County's 3% cannabis tax and, in Chicago, an additional 3% city cannabis tax. In Chicago those layers add 22.25% to flower at or under 35% THC and 37.25% to a product above it, before local general sales tax. That is why a Chicago receipt runs higher than a Michigan or Nevada one: a $40 cart above 35% THC is about $54.90 at a Chicago register.

The city line is the one Illinois boundary that reliably changes a price. Chicago adds a 3% municipal cannabis tax; no suburb is obliged to match it, though Illinois statute lets each one levy up to 3% of its own and counties may add a share, so the suburban rate is set village by village rather than being uniformly lower. On an $80 purchase the Chicago surcharge alone is about $2.40, and anything beyond that comes from the stores themselves rather than from tax. Eight of our tracked Illinois stores sit outside the city — Dutchess Oak Park IL about nine miles west of the Loop, Dutchess Morton Grove IL sixteen miles north, Consume St Charles IL forty miles west — and the Chicago Suburbs page lists what each is charging today.