[4] According to the 2020 "ACS 5-Year Estimates Data Profiles", 37.4% of the township's population spoke only English, while 62.6 spoke an "other [than Spanish] Indo-European language"[3] (basically Pennsylvania German/German).

Named for Samuel Parkman,[5] an agent with the Connecticut Land Company, it is the only Parkman Township statewide.

[6] Located in the southeastern corner of the county, it borders the following townships: No municipalities are located in Parkman Township, although the unincorporated community of Parkman lies in the southern part of the township.

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,[8] 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.