- Lakeside Congregation is a Reform Jewish synagogue of approximately 360 member families located in Highland Park, Illinois. We are an inclusive, welcoming and supportive community that embraces individual belief and customs and fosters personal and spiritual growth. Lakeside supports and encourages mitzvot (good deeds), tikkun olam (social justice), worship, education and social experiences. A variety of services nurture our spirit with prayer, music and reflection. We are home to a nationally accredited Religious and Hebrew School, a vital Sisterhood, continuing adult education and much more.