Below is a list of Round Lake Park IL zip codes. For your research we have also included Round Lake Park Area Code, Time Zone, UTC and the local Lake County FIPS Code. Each Round Lake Park Illinois zip code has a center Longitude / Latitude point (the Round Lake Park center is -88.092498779297 / 42.35179901123). For your convenience we have also indicated if that zip code in Round Lake Park observes Daylight Savings time.