[4] Located in the northern part of the county, it borders the following townships: No municipalities are located in Mill Creek Township.

According to the 2020 "ACS 5-Year Estimates Data Profiles", 37.3% of the township's population spoke only English, while 62.7 spoke an "other [than Spanish] Indo-European language"[3] (basically Pennsylvania German/German).

Mill Creek Township was organized in July, 1817.

[5] The township is governed by a three-member board of trustees, who are elected in November of odd-numbered years to a four-year term beginning on the following January 1.

There is also an elected township fiscal officer,[6] who serves a four-year term beginning on April 1 of the year after the election, which is held in November of the year before the presidential election.