HAVRE DE GRACE, a city of Harford county, Md., U.S.A., 36m. N.E. of Baltimore, at the head of Chesapeake Bay and the mouth of the Susquehanna river. It is served by the Baltimore and Ohio and the Pennsylvania railways, and by steam boat lines. The population was 4,377 in 192o, 3,985 in 1 930. It has several manufacturing industries and a considerable trade in coal, lumber and fish. There is a fine race-track here, of national repute, and at Aberdeen, 5m. S.E., are the U.S. artillery proving grounds.