As of today, , there are 218 properties listed for sale in ZIP code 62002 and 218 properties listed for sale in the city of Alton. Of those 218 properties, there are 216 single family houses and 2 condos. The last known list price for 420 Henry St was $108,833, which is 36% above the current median price of $79,900 for Alton and 36% above the median of $79,900 for 62002. 420 Henry St is a duplex (2 units, any combination) home that is approximately 1,607 square feet, which is 22% above the median size in Alton of 1,322 square feet and 22% above the median size in 62002 of 1,322 square feet. This property's price per square foot was $68, which is 3% above the current median in 62002 of $66 and 3% above the Alton median of $66.