The organ in Immaculate Conception Church is Opus 10719 of the M.P. Moller Company, Inc, Hagerstown, Maryland. It was built in 1971, as a memorial to John T. Waldhauser, Jr., and Mrs. Edward H. (Bessie) Burke. The tonal consultant was Donald King. Tonal and mechanical revisions are currently being done by David M. Storey. An asterisk (*) indicates a change in the instrument.

Great Organ - Unenclosed
(The number after each stop name generally indicates the length in feet of the lowest pipe in the rank or set of pipes, usually 61 pipes for Great and Swett, and 32 pipes for the Pedal. Example: the Principal 8'. The lowest pipe is 8 feet tall, and the rank has 61 pipes.)

• *Gedeckt 16' (Revoiced)
• *Principal 8' (pipes reversed with Octave 4' and revoiced, increase in volume)
• *Rohrflote 8' (revoiced, increase in volume)
• *Octave 4' (pipes reversed with Principal 8' and revoiced, decrease in volume)
• *Waldflote 2' (revoiced, decrease in volume)
• Sesquialtera II ranks 2 2M'and 1 3/5'
• *Fournature III - V ranks 2', 1 1/3', I' (revoiced, decrease in volume)
• *Cromorne 8' (New rank of pipes, replaces Gemshorn 8')
• *Trompette en chamade 8' (From Swell) (Increase in wind pressure/volume)
• Tremblant

Swell Organ - Enclosed

• *Bordon 8'(Revoiced)
• Viola 8'
• Viola Celeste 8'
• Blockflote 4'
• Principal 2'
• Quinte 1 1/3'
• *Cymbal III ranks 1/2', 1/3', 1/4' (Pitch lowered, one octave, some pipes replaced)
• *Trompette (new rank of pipes, replaces Trichter Regal)
• *Trompette en chamade 8' (from Great)
• Tremblant

Pedal Organ

• *32' Grande Cornet
• *32' Resultant
• Contrabasse 16'
• *Subbass 16' (New rank pipes, replaces Gedeckt 16')
• Octave 8'
• Bourdon 8'
• Spitzflote 4'
• *Octave 4' (removed from the pedal Mixture to play independently)
• Mixture II ranks 2 2/3', 2'
• Fagott 16'
• Fagott 8'
• 4' Cromorne (from Great)

*Couplers (Moved from drawknobs to a new coupler rail)

• *Swell to Great 16' (new)
• Swell to Great 8'
• Swell to Great 4'
• *Swell to Swell 16' (new)
• Swell to Swell 4'
• Great to Pedal 8' (reversible)
• Swell to Pedal 8' (reversible)
• Swell to Pedal 4'
• Crescendo Pedal
• Sforzando Reversible
• Zimbeistern (reversible)