At its first meeting, March 9th, 1818, the board of commissioners established Armstrong Township with the following boundaries:
Beginning at the northwest corner of Vanderburgh county, at the range line dividing ranges 11 and 12, thence south with said line to the township line dividing townships 5 and 6, thence east with said line to the old Redbanks road, thence north with the meanders thereof to the line dividing Vanderburgh and Gibson Counties, thence west with said line to the place of beginning.

At its first meeting, March 9th, 1818, the board of commissioners established Armstrong Township with the boundaries listed above. The board then ordered that the remainder of the county be known and designated as Pigeon township.

Union Township includes all of the southwest part of the county bounded on the north by the Big Bayou Creek and on the other sides by the Ohio river.

Scott Township was bounded as follows:
Beginning at the county line dividing the counties of Warrick and Vanderburgh [where the same intersects the line dividing townships 5 and 6], running north as far as the latter county extends, thence west on the county line seven miles, thence south to the line dividing townships 5 and 6 in range 11 west, thence east on said line to place of beginning. The township was named in honor of Samuel Scott, at whose house the first election was held, Joseph Baldwin being the inspector.

Perry Township was organized out of the west end of Pigeon township, with bounds as follows:
Commencing on the Ohio river at the line dividing fractional sections 25 and 26, in township 6 south, of range 11 west, running thence north to the line dividing townships 5 and 6, thence west to the Posey county line, thence south with said river to the Ohio River, thence up said river to the bayou, thence up said bayou to where it again intersects the Ohio river, thence up said river with the meanders thereof to the place of beginning

May 14, 1888, a change was made in the township boundary lines by which the following described territory was taken from Perry and added to Pigeon township:
Commencing at the northeast corner of section 26, township 6 south, of range 11 west, and running thence due west along the line dividing sections 26 and 23 in said township and range to the north and south half section line of said section 26; thence south along said half section line and the half section line of section 35 in said township and range, to the Ohio river; thence north and northeast up said river to a point where the east line of said section 26 strikes said river, and thence north along said east line of said section 26 to the place of beginning; the territory embraced being the east fractional half sections of sections 26 and 35, in township 6 south, of range 11 west. On the question of making this change Commissioners Wunderlich and King voted "aye," and Commissioner Bower voted "no."

Knight Township was organized out of the east end of Pigeon township, with bounds as follows:
Beginning on the Ohio river at the line dividing fractional sections 8 and 9, in township 7 south, range 10 west, and running north to the line dividing townships 5 and 6; thence east to the Warrick county line, thence south with said line to the Ohio river, thence down said river with the meanders thereof to the place of beginning.

September 7, 1846, the west one-half of section 21, township 6 south, of range 10 west, was taken from Knight and added to Pigeon township.

Center Township was organized with the following bounds:
Beginning at the junction of Locust with Pigeon creek and running along said Pigeon creek to the Warrick county line; thence due north with said line to the northeast corner of section No. 24, township 5 south, of range 10 west; thence due west to the east line of Armstrong township; thence due south to Locust creek; thence along Locust creek to the place of beginning.

German Township, formed out of Perry and Armstrong, was bounded as follows:
Commencing at the northeast corner of section 14, township 5 south, range 11 west, and running thence west to the northwest corner of section 15, same town and range; thence south to the southwest corner last named of section 7; thence west to the northwest corner of section 19, same town and range; thence south to the southwest corner of section 7, in township 6, range 11 west; thence east to the southeast corner of section 11, town and range last named; thence north to the place of beginning.