Trying to find the Zipcode for your new address. Well, this morning I was too. I checked my contract on my new apartment. Tried dialing the security guards at the gate. Nobody knew. Turns out you can dial 11185 anywhere in China to lookup the postal code for a given address.
查询邮政编码 11185 (Inquire about Zip Codes) 公交热线 63175522 (Public Transit Hotline) 公安热线 24023456 (Public Security Hotline AKA Police)
There are several more numbers courtesy of the SongJiang’s (Shanghai Suburb) municipal government website. Check it out