See all 290 one bedroom apartments currently available for rent in Allegheny County, PA. Check prices, compare amenities, view photos and floor plans, and explore area maps. The cheapest 1 bedroom apartment for rent in Allegheny County, PA has a monthly rent of $850 while the most expensive 1 bedroom apartment has a monthly rent of $4,206. Once you find the perfect 1 bedroom apartment, you can submit your lease application and receive a timely response to it. Residents of Allegheny County, PA apartment buildings listed on RentCafe can also submit online maintenance requests, renew their lease, and pay rent online (where available).