Off the top of my head:

Musicals:

Cox and Box
Dames at Sea
The Fantasticks
Godspell
Guttenberg: The Musical
I Do, I Do
The Roar of the Greasepaint, the Smell of the Crowd
Snoopy, The Musical
Stop the World, I Want to Get Off
[title of show]
Triumph of Love
You’re A Good Man, Charlie Brown

Plays:

All I Really Need to Know I Learned in Kindergarten
All in the Timing
Almost, Maine
Art
Blind Date
The Cemetery Club
The Complete Works of Shakespeare (Abridged)
Don Juan in Hell
Driving Miss Daisy
Every Christmas Story Ever Told (And Then Some!)
First Night
Jacob Marley’s Christmas Carol
Love Letters
The Odd Couple
Scotland Road
Shooting Star
Somewhere In Between
Spoon River Anthology
The Star-Spangled Girl
Three Viewings
A Walk in the Woods
Yankee Tavern

Break a leg!

I've been in, and/or directed almost all of these shows. I know they can be performed on the size stage you described. What I don't know is how much wing/backstage area you have.

A few of the shows I named have some adult themes, but most are G to PG13 types. - Key piece of advice: Use your space, and don't be afraid.

There are even a few Shakespeares you can do. A Midsummer Night's Dream comes immediately to mind. (Again, you'd need decent offstage room to stash the actors when they're not on stage.)

Hope this helps. If you need any advice along the way, I'd be glad to be your sounding board.

Edited by edh915 - 10/27/15 at 11:15pm