As of , there are 231 properties listed for sale in the city of Alton and 231 properties listed for sale in the ZIP code 62002. Those 231 Alton properties include 230 single family homes and 1 condos. This duplex (2 units, any combination) home located at 420 Henry St in 62002 was last listed for $108,833. This is 36% above the median of $79,900 for that ZIP code and 36% above the current median price of $79,900 for Alton. 420 Henry St is roughly 1,607 Sqft, which is 20% above the Alton median of 1,344 and 20% above the 62002 ZIP code median of 1,344. This property's price per square foot was $68, which is N/A below the current median price in 62002 of $68 and N/A below the Alton median of $68 per square foot.