Is contae suite in oirdheisceart Pennsylvania é Mifflin. I 2010 bhí cónaí ar 46,682 duine i gcontae Mifflin suas ó 46,486 duine sa bhliain 2000. Is é Lewistown príomhbhaile an contae. Tá an contae 1,070 km2 san iomlán (talamh+uisce).
De réir daonáireamh S.A.M. 2000 ba í Béarla an teanga ba chomónta i gcontae Mifflin agus í mar phríomhtheanga ag 40,430(93.12%) duine sa chontae. Bhí Gearmáinis Amanaigh ar an dara teanga ba chomónta sa chontae agus í mar phríomhtheanga ag 1,649(3.80%) duine, bhí Ollainnis ar an tríú teanga ba chomónta agus í mar an phríomhtheanga ag 434(1.00%) duine sa chontae.
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