The +4 on the end zip a zip code gives the carrier additional information on the specific address. For example what side of the road is the box located on. Therefore the +4 can not be determined based on city and state.
You can look up individual addresses here https://tools.usps.com/go/ZipLookupAction!input.action
The +4 code may be useful if you are sending bulk mail at a discounted price. Looking up many addresses individually may cost more in time and effort than you would save with discount postage. In that case your best bet would be to work with a bulk mail service. Locally you may want to try http://www.elmstreetwebsolutions.com/... more
There are two great YMCA's in this area. The one in Rockport is terrific as well as the one in Belfast. We also have the MRC, Mid Coast Rec Center, in Rockport which has an ice rink and tennis courts.... more