He's not from an imaginary Ohio, he's from an imaginary Riverside, Iowa.
John Glen was from Ohio. A couple of the other astronauts were, too:
Akron: Judith ResnikSymbol venus.svg (1949–1986), died on the Challenger — STS-41-D
Bryan: Terence T. Henricks — STS-44, STS-55, STS-70, STS-78
Cambridge: John Glenn (1921–2016), first American in Earth orbit, U.S. Senator, and oldest person to make a spaceflight — Mercury 6, STS-95
Cincinnati: Karl Gordon Henize (1926–1993) — STS-51-F
Cleveland: Kenneth D. Cameron — STS-37, STS-56, STS-74
Cleveland: Gregory J. Harbaugh — STS-39, STS-54, STS-71, STS-82
Cleveland: Jim Lovell, first NASA astronaut to fly four times, first man to fly to the moon twice — Gemini 7, Gemini 12, Apollo 8, Apollo 13
Cleveland: G. David Low (1956–2008) — STS-32, STS-43, STS-57
Cleveland: Donald A. Thomas — STS-65, STS-70, STS-83, STS-94
Cleveland: Carl Walz — STS-51, STS-65, STS-79, STS-108/111
Cleveland: Mary E. WeberSymbol venus.svg — STS-70, STS-101
Columbus: Donn F. Eisele (1930–1987) — Apollo 7
Columbus: Michael Foreman — STS-123, STS-129
Dayton: Charles Bassett (1931–1966) — No spaceflights
Euclid: Sunita WilliamsSymbol venus.svg — STS-116/117, Soyuz TMA-05M
Lorain: Robert F. Overmyer (1936–1996) — STS-5, STS-51-B
Macedonia: Ronald Sega — STS-60, STS-76
Mansfield: Michael L. Gernhardt — STS-69, STS-83, STS-94, STS-104
Parma: Michael T. Good — STS-125, STS-132
Wapakoneta: Neil Armstrong (1930–2012), piloted first docking in space, first person to land a spacecraft on the Moon, first person to walk on the Moon — Gemini 8, Apollo 11
Warren: Ronald A. Parise (1951–2008) — STS-35, STS-67
The place where the astronauts in "Martian Chronicles" took off from was in an imaginary Ohio.
Very good book, Martian Chronicles; Ray Bradbury also wrote Dandelion Wine, Illustrated Man, October County, Something Wicked This Way Comes, I Sing the Body Electric, R is for Rocket. All really well worth the reading. They are not "space" stories. Most of the chapters of his books can stand alone as beautiful short stories. I'll be on Amazon when I finish this.
Really if you would read Dandelion Wine or Martian Chronicles, you'd thank me for turning you onto them.