Is contae in iarthuaisceart Pennsylvania é Clarion. Sa bhliain 2010 bhí cónaí ar 39,988 duine i gcontae Clarion, laghdaithe ó 41,765 duine sa bhliain 2000. Tá achar 1,600 km2 sa chontae san iomlán.
De réir daonáireamh S.A.M. 2000 is í Béarla an teanga is coitianta i gcontae Clarion agus í mar phríomhtheanga ag 38,440 (97.96%) duine sa chontae. Ba í Spáinnis an dara teanga is mó labhartha sa chontae agus í mar phríomhtheanga ag 290 (0.74%) duine, agus ba í Gearmáinis an tríú teanga is comónta agus í mar phríomhtheanga ag 265 (0.67%) duine. Maíonn 46% de na daoine gur de shliocht Ghearmánach iad, agus 9.8% gur de shliocht Éireannach iad.
Allegheny Mountains • Allegheny National Forest • Allegheny Plateau • Atlantic Coastal Plain • Bald Eagle Valley • Blue Ridge • Central • Coal Region • Cumberland Valley • Delaware Valley • Dutch Country • Eastern • Endless Mountains • Great Valley • Mahoning Valley • Happy Valley • Laurel Highlands • Lehigh Valley • Main Line • Moshannon Valley • Nittany Valley • Northeastern • Northern Tier • Northwestern • North Penn Valley • Ohio Valley • Oil Region • Oley Valley • Pennsylvania Highlands • Penns Valley • Philicon Valley • Piedmont • Pocono Mountains • Ridge and Valley • Saucon Valley • South Central • Southeastern • Southern • Southwestern • Susquehanna Valley • Western • Wyoming Valley