Martelle, IA

ZIP code 52305 is located in Anamosa, Iowa. This area is home to the Anamosa State Penitentiary, a historic prison opened in 1875 and currently housing inmates. The Wapsipinicon State Park is also located in this zip code, offering outdoor recreational activities such as hiking, camping, and picnicking along the Wapsipinicon River. Anamosa also features a charming downtown area with shops, restaurants, and other amenities.