From the 1882 Iowa State Gazeteer and Business Directory:

ALLEN'S GROVE. In Scott county, 3 miles from Donahue, a small settlement on the Davenport line C. M. & St. P Ry and 15 northwest of Davenport (c h), its nearest bank location. Produce is shipped. Mail semi-weekly. W.B. Stephens, postmaster.

Donahue Wm B, railroad and exp agt.
Grell Emry, constable.
Grell James, justice of peace.
Hasenmier Joseph, shoemaker.
Jenner F, hotel and saloon.
Stephens W B, general store.