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2. Allegheny County, Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Allegheny_County,_Pennsylvania

   Pennsylvania. (2020) Allegheny County (/ ˌælɪˈɡeɪni / AL-ig-AY-nee) is a county in Pennsylvania, United States. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, after Philadelphia County. Its county seat and most populous city is Pittsburgh, Pennsylvania's second most populous city. [ 2 ]

3. List of Pennsylvania state historical markers in Allegheny ...

   en.wikipedia.org/wiki/List_of_Pennsylvania_state...

   This is intended to be a complete list of the official state historical markers placed in Allegheny County, Pennsylvania by the Pennsylvania Historical and Museum Commission (PHMC). The locations of the historical markers, as well as the latitude and longitude coordinates as provided by the PHMC's database, are included below when available.

4. National Register of Historic Places listings in Allegheny ...

   en.wikipedia.org/wiki/National_Register_of...

   Allegheny River Lock and Dam No. 4. Allegheny River Lock and Dam No. 4. April 21, 2000. (#00000398) 1 River Avenue. 40°36′52″N 79°42′59″W  /  40.614444°N 79.716389°W  / 40.614444; -79.716389  (Allegheny River Lock and Dam No. 4) Harrison Township. Extends into Lower Burrell in Westmoreland County. 4.

5. Allegheny County Courthouse - Wikipedia

   en.wikipedia.org/wiki/Allegheny_County_Courthouse

   1968 [ 3 ] References. [ 5 ][ 6 ][ 7 ] The Allegheny County Courthouse in downtown Pittsburgh, Pennsylvania, is part of a complex (along with the old Allegheny County Jail) designed by H. H. Richardson. The buildings are considered among the finest examples of the Romanesque Revival style for which Richardson is well known.

6. Carnegie Free Library of Allegheny - Wikipedia

   en.wikipedia.org/wiki/Carnegie_Free_Library_of...

   United States historic place Carnegie Free Library of Allegheny U.S. National Register of Historic Places City of Pittsburgh Historic Structure Pittsburgh Landmark – PHLF Show map of Pittsburgh Show map of Pennsylvania Show map of the United States Location Allegheny Center, Pittsburgh, Pennsylvania Coordinates 40°27′11″N 80°0′19″W  /  40.45306°N 80.00528°W  / 40.45306 ...

7. Allegheny, Pennsylvania - Wikipedia

   en.wikipedia.org/wiki/Allegheny,_Pennsylvania

   412. Allegheny City was a municipality that existed in the U.S. state of Pennsylvania from 1788 until it was annexed by Pittsburgh in 1907. It was located north across the Allegheny River from downtown Pittsburgh, with its southwest border formed by the Ohio River, and is known today as the North Side. The city's waterfront district, along the ...