[4] It has a warm-summer humid continental climate (Dfb), and average temperatures in Clarion borough range from 24.5 °F in January to 82 °F in July.

[5] Clarion County is one of the 423 counties served by the Appalachian Regional Commission,[6] and it is identified as part of the "Midlands" by Colin Woodard in his book American Nations: A History of the Eleven Rival Regional Cultures of North America.

43.9% were English or Welsh, 12.9% American, 10.5% German, 8.0% Irish, 6.3% Scotch-Irish, 5.5% Italian and 2.6% Dutch, and 2.0% French ancestry.

[16] Chart of Voter Registration Public school districts and private schools in the county are served by Riverview Intermediate Unit IU6 which provides special education and professional development services.

Clarion County Career Center is located along State Route 66 in Marianne (Shippenville address).

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns.