| Republican | 1924 | Incumbent re-elected. | nowrap | |- ! | James J. Connolly | | Republican | 1920 | Incumbent re-elected. | nowrap | |- ! | George A. Welsh | | Republican | 1922 | Incumbent re-elected. | nowrap | |- ! | George P. Darrow | | Republican | 1914 | Incumbent re-elected. | nowrap | |- ! | Thomas S. Butler | | Republican | 1896 | | Incumbent died May 26, 1928.New member elected.Republican hold.Winner also elected to finish the term, see above. | nowrap | |- ! | Henry Winfield Watson | | Republican | 1914 | Incumbent re-elected. | nowrap | |- ! | William Walton Griest | | Republican | 1908 | Incumbent re-elected. | nowrap | |- ! | Laurence H. Watres | | Republican | 1922 | Incumbent re-elected. | nowrap | |- ! | John J. Casey | | Democratic | 1926 | Incumbent re-elected. | nowrap | |- ! | Cyrus Maffet Palmer | | Republican | 1926 | | Incumbent lost renomination.New member elected.Republican hold. | nowrap | |- ! | Robert Grey Bushong | | Republican | 1926 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Louis T. McFadden | | Republican | 1914 | Incumbent re-elected. | nowrap | |- ! | Edgar R. Kiess | | Republican | 1912 | Incumbent re-elected. | nowrap | |- ! | Frederick W. Magrady | | Republican | 1924 | Incumbent re-elected. | nowrap | |- ! | Edward M. Beers | | Republican | 1922 | Incumbent re-elected. | nowrap | |- ! | Isaac Hoffer Doutrich | | Republican | 1926 | Incumbent re-elected. | nowrap | |- ! | James Russell Leech | | Republican | 1926 | Incumbent re-elected. | nowrap | |- ! | J. Banks Kurtz | | Republican | 1922 | Incumbent re-elected. | nowrap | |- ! | Franklin Menges | | Republican | 1924 | Incumbent re-elected. | nowrap | |- ! | James Mitchell Chase | | Republican | 1926 | Incumbent re-elected. | nowrap | |- ! | Samuel Austin Kendall | | Republican | 1918 | Incumbent re-elected. | nowrap | |- ! | Henry Wilson Temple | | Republican | 1912 | Incumbent re-elected. | nowrap | |- ! | J. Howard Swick | | Republican |