Grayslake Antique Flea Market is an upscale indoor/outdoor vintage and antique market held at the Lake County Fairgrounds in Grayslake, Illinois. The two-day market brings together more than 200 dealers offering antiques, estate finds, vintage decor, and collectibles, drawing both serious collectors and casual shoppers. Visitors can browse curated vendor booths alongside outdoor flea-market rows for a broad mix of furniture, decorative items, and unique one-of-a-kind pieces.