I have a lot of postcards in my collection that are probably from Springfield, but remain unidentified. From time to time I stumble across a house by complete luck, but for the most part that is difficult because it is limited to areas I frequently travel.
Today, I learned that Google Maps has extended their "street view" to Springfield. This is a remarkable advance in the map world because it allows you to see a street level view of most streets in the city. You can "virtually drive around" and see everything.
Shortly after I started "exploring", I came across a building on Lichfield Street -- in the Forest Park Heights Historic District -- that I knew I had seen before.
Compare to this postcard:
Looks like a match to me, except that the previously-open porches are now enclosed, the house is now sided, and some/most windows have been replaced.
This should be a fun new tool to work with, and to identify more postcards.