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About Us

57+

Years

MDUA was established in 1967

to umpire Baltimore City

baseball games

110+

Members

Currently, there are 110+ 

active umpires within 

this association. 

80+

Schools

MDUA provides umpires to

public and private schools in

Baltimore and surrounding counties.

Mason Dixon Umpires Association (MDUA) provides umpires for:

  • Maryland Interscholastic Athletic Association (MIAA)

  • Maryland Public Secondary Schools Athletic Association (MPSSAA) servicing Baltimore County, Baltimore City, Carroll, and Frederick Counties

  • Maryland Independent Athletic Conference (MIAC)

  • Maryland Association of Christian Schools Athletic Conference (MACSAC)

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