Pretty much all the "double-O" (actually double-zero) Martins are short scale - except maybe the "Women in Music" ("DB") series, I think.
With triple-zero Martins it gets confusing as hell. Essentially, 14-fret 000's in the "Standard" series and higher are short scale. All their 12-fret 000 models, and 14-fret 000's in the "16" and lower series are long scale. Clear as mud?
If I felt the need for a short scale and were well heeled, I'd get either a new Collings 00-2H or an old Martin 00-18. Or the Martin 00-18V. If I felt the need for a short scale, and were not so well heeled, a Martin 00-15.