MapForums

My company is needing to find software that allows me to make a map of the U.S. and a few other regions internationally and place pinpoints (dots) to represent where a store is located. We would like this to be done by either city or zip code. We don't want any other topographical or city informaiton, just one dot to represent the zip code of where the store is located. Is there software available for you to just enter in the data such as "Houston, TX" and it places a dot on the map where it's located?