Kosher in Columbus, Ohio
I have lived in Columbus most of my life and grew up in a kosher orthodox home (no longer keep kosher). There used to be an exclusive kosher butcher/grocery store that was independent, but unfortunately that is no more. Several of the large grocery chains (Kroger, Giant Eagle, Meijer) have kosher sections. The Jewish community is based on the East side of the city. The Kroger in Town & Country shopping center has a Glatt kosher butcher counter supervised by the Vaad H'or along with an extensive amount of kosher products. There is a kosher bakery, Matt's, on E. Broad St. as well. In addition, there are opportunities to have kosher meat and other products delivered to Columbus from Cleveland, where there is a much larger Jewish community.
As for kosher restaurants, there are not any that I am aware of. However, if you are willing to eat vegetarian, there are quite a few located in the Short North and OSU campus area, including Dragonfly Neo Cuisine, http://neo-vevents.com/ which is owned by a Jewish fellow.
There are at least 3-4 Orthodox shuls, a couple of Conservative and several Reform congregations. A lot of New Yorkers have made the move because of the vibrant Jewish community, much lower cost of living, etc. If you are interested in exploring this further, reply back with an email address and I will get in touch with you.