{"level":"state","name":"Illinois","state":"IL","page":"https://www.retrorate.com/assumable-mortgages/illinois","parent":{"name":"United States","page":"https://www.retrorate.com/assumable-mortgages"},"counted_as_of":"2026-10-15","market_rate":{"value":7.3,"label":"average 30-year fixed rate","as_of":"2026-10-16","source":"Optimal Blue Mortgage Market Indices (OBMMI)"},"savings_basis":{"comparison":"the assumable loan against a new loan for the same amount, at the same cash to close","includes":"principal and interest only","remaining_term_years":25,"remaining_term_assumed":true},"coverage":{"tier":"B","on_market":"off-market only: counts cover homes with a mortgage carrying an assumable loan"},"figures":{"assumable_homes":417349,"avg_assumable_rate":4.61,"avg_balance":197099,"avg_monthly_savings":243,"rate_bands":{"under_3":48725,"3_to_4":126157,"4_to_5":96453,"5_and_over":146014}},"markets":[{"name":"Chicago","page":"https://www.retrorate.com/assumable-mortgages/illinois/chicago","data":"https://www.retrorate.com/assumable-mortgages/illinois/chicago.json","assumable_homes":63353,"avg_assumable_rate":4.71,"avg_monthly_savings":279,"on_market_coverage":false},{"name":"Aurora","page":"https://www.retrorate.com/assumable-mortgages/illinois/aurora","data":"https://www.retrorate.com/assumable-mortgages/illinois/aurora.json","assumable_homes":9664,"avg_assumable_rate":4.65,"avg_monthly_savings":214,"on_market_coverage":false},{"name":"Rockford","page":"https://www.retrorate.com/assumable-mortgages/illinois/rockford","data":"https://www.retrorate.com/assumable-mortgages/illinois/rockford.json","assumable_homes":9193,"avg_assumable_rate":5,"avg_monthly_savings":111,"on_market_coverage":false},{"name":"Joliet","page":"https://www.retrorate.com/assumable-mortgages/illinois/joliet","data":"https://www.retrorate.com/assumable-mortgages/illinois/joliet.json","assumable_homes":8522,"avg_assumable_rate":4.65,"avg_monthly_savings":223,"on_market_coverage":false}],"terms":{"publisher":"RetroRate (Assumable Technologies Inc.)","source":"RetroRate production data, from public data sources and county records","attribution":"Cite as RetroRate, with a link to the page URL.","contact":"press@retrorate.com","documentation":"https://www.retrorate.com/assumable-mortgages"}}