It was Cox's Station before it became Bel Alton. Found the following from the 1878 Charles County Directory;
COX'S STATION
Is on the Pope's Creek branch of the B. & P. R. R., 70 miles from Baltimore. Climate healthy; busineqi fair; crops generally good; land is medium, easily improved, mostly cleared, but plenty of timber for all purposes yet standing. Land can be bought at from $5 to $15 per acre. Produces 15 to 80 bus. wheat, 15 to 40 oats, 25 to 50 corn, and 500 to 1,200 lbs. tobacco; potatoes and hay not raised as a crop, but the land is well adapted to the growth of each. Churches near; Public School, Miss Lizzie Semmes, teacher. Population 25. Samuel Cox, Postmaster.
Attorneys at Law
Cox, Samuel Jr
Matthews, J F
Blacksmith.
Hayden, C F
Carpeaater.
Taylor, Joseph
General Merchandise.
Tennison, B Z
Hotel
Schmidt, John
Miller.
Ammon, Col J S
Painter.
Milton, Chas H.
Physician.
Jamison, B A