Download the list of Obstetrician-gynecologists in Illinois. Smartscrapers provides an accurate directory and the latest data on the number of Obstetrician-gynecologists in Illinois There are 5171 Obstetrician-gynecologists in Illinois as of October 15, 2025; which is an 0.00% increase from 2023. Of these locations, 2386 Obstetrician-gynecologists which is 46.14% of all Obstetrician-gynecologists in Illinois are single-owner operations, while the remaining 2785 which is 53.86% are part of larger brands. The top three cities with the most Obstetrician-gynecologists are Chicago with 3978 Obstetrician-gynecologists, Peoria with 131 Obstetrician-gynecologists, Poplar Grove with 121 Obstetrician-gynecologists. Average age of Obstetrician-gynecologists in Illinois is 5 years and 8 months.