Howard W. Stull was born on a farm near Johnstown, Pennsylvania.
He served as post office clerk at Johnstown in 1897 and 1898 and as assistant postmaster from 1899 to 1904.
In 1905 he moved to Washington, D.C., and served as an assistant division chief in the United States Treasury Department from 1905 to 1908.
He was admitted to the bar the same year and commenced practice in Colville, Washington, in 1909.
Stull was elected as a Republican to the Seventy-second Congress to fill the vacancy caused by the resignation of J. Russell Leech.