| Rank | City | 2006 Population (Est.) | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Philadelphia | 1,517,628 | 0.1% |
| 2 | Pittsburgh | 316,206 | -1.1% |
| 3 | Allentown | 106,550 | -0.0% |
| 4 | Erie | 102,617 | -0.2% |
| 5 | Reading | 80,440 | -0.2% |
| 6 | Scranton | 73,002 | -0.8% |
| 7 | Bethlehem | 72,509 | 0.3% |
| 8 | Lancaster | 55,236 | -0.5% |
| 9 | Harrisburg | 47,332 | -0.6% |
| 10 | Altoona | 46,789 | -1.1% |
| 11 | Wilkes-Barre | 41,254 | -0.8% |
| 12 | York | 40,220 | -0.5% |
| 13 | State College | 38,832 | 0.2% |
| 14 | Chester | 36,778 | -0.1% |
| 15 | Bethel Park | 32,171 | -0.8% |
| 16 | Norristown | 30,604 | -0.5% |
| 17 | Williamsport | 29,929 | -0.5% |
| 18 | Monroeville | 28,055 | -0.8% |
| 19 | Plum | 26,361 | -0.4% |
| 20 | Easton | 26,192 | -0.0% |
| 21 | New Castle | 24,803 | -1.1% |
| 22 | Lebanon | 23,833 | -0.5% |
| 23 | McKeesport | 22,564 | -1.2% |
| 24 | Johnstown | 22,292 | -1.3% |
| 25 | Hazleton | 22,031 | -1.1% |
| 26 | Pottstown | 21,471 | -0.4% |
| 27 | West Mifflin | 20,930 | -1.1% |
| 28 | Murrysville | 19,217 | 0.4% |
| 29 | Baldwin | 18,660 | -1.2% |
| 30 | Carlisle | 18,280 | 0.1% |
| 31 | West Chester | 18,147 | 0.3% |
| 32 | Chambersburg | 17,842 | 0.0% |
| 33 | Wilkinsburg | 17,516 | -1.3% |
| 34 | Hermitage | 16,313 | 0.1% |
| 35 | Lansdale | 15,836 | -0.3% |
| 36 | Greensburg | 15,580 | -0.4% |
| 37 | Phoenixville | 15,325 | 0.7% |
| 38 | Sharon | 15,295 | -1.2% |
| 39 | Hanover | 14,896 | 0.4% |
| 40 | Washington | 14,772 | -0.5% |
| 41 | Indiana | 14,761 | -0.3% |
| 42 | Pottsville | 14,610 | -1.2% |
| 43 | Butler | 14,350 | -1.0% |
| 44 | Dunmore | 13,945 | -0.5% |
| 45 | New Kensington | 13,926 | -1.0% |
| 46 | St. Marys | 13,715 | -1.1% |
| 47 | Whitehall | 13,711 | -1.0% |
| 48 | Meadville | 13,383 | -0.4% |
| 49 | Kingston | 13,109 | -1.0% |
| 50 | Ephrata | 13,029 | -0.2% |
| 51 | Bloomsburg | 12,822 | 0.8% |
| 52 | Lower Burrell | 12,308 | -0.5% |
| 53 | Elizabethtown | 11,863 | -0.0% |
| 54 | Uniontown | 11,807 | -1.0% |
| 55 | Franklin Park | 11,759 | 0.6% |
| 56 | Yeadon | 11,433 | -0.5% |
| 57 | Coatesville | 11,426 | 1.0% |
| 58 | Munhall | 11,379 | -1.3% |
| 59 | Emmaus | 11,297 | -0.0% |
| 60 | Aliquippa | 10,921 | -1.3% |
| 61 | Oil City | 10,837 | -1.1% |
| 62 | Lansdowne | 10,726 | -0.6% |
| 63 | Wyomissing | 10,354 | -0.1% |
| 64 | Nanticoke | 10,334 | -1.1% |
| 65 | East Stroudsburg | 10,297 | 0.8% |
| 66 | Berwick | 10,273 | -0.9% |
| 67 | Jeannette | 10,087 | -1.0% |
| 68 | Columbia | 10,073 | -0.5% |
| 69 | Darby | 9,988 | -0.6% |
| 70 | Sunbury | 9,967 | -1.2% |
| 71 | Brentwood | 9,780 | -1.3% |
| 72 | Bristol | 9,737 | -0.4% |
| 73 | Morrisville | 9,728 | -0.6% |
| 74 | Waynesboro | 9,665 | 0.1% |
| 75 | Jefferson Hills | 9,651 | -0.1% |
| 76 | Northampton | 9,650 | 0.5% |
| 77 | Warren | 9,523 | -1.4% |
| 78 | Carbondale | 9,333 | -0.9% |
| 79 | Beaver Falls | 9,303 | -1.2% |
| 80 | Economy | 9,177 | -0.4% |
| 81 | Swissvale | 9,015 | -1.3% |
| 82 | Lititz | 8,984 | -0.1% |
| 83 | Middletown | 8,804 | -0.7% |
| 84 | Mechanicsburg | 8,785 | -0.5% |
| 85 | Quakertown | 8,753 | -0.4% |
| 86 | Dormont | 8,708 | -1.3% |
| 87 | Canonsburg | 8,700 | 0.2% |
| 88 | Perkasie | 8,660 | -0.4% |
| 89 | Lock Haven | 8,650 | -1.1% |
| 90 | Lewistown | 8,587 | -0.9% |
| 91 | Latrobe | 8,565 | -0.9% |
| 92 | Bradford | 8,546 | -1.3% |
| 93 | Connellsville | 8,542 | -1.2% |
| 94 | Old Forge | 8,538 | -0.5% |
| 95 | Collingdale | 8,446 | -0.5% |
| 96 | Castle Shannon | 8,306 | -0.7% |
| 97 | White Oak | 8,275 | -0.6% |
| 98 | Bellevue | 8,234 | -1.3% |
| 99 | Monessen | 8,214 | -1.0% |
| 100 | Ellwood City | 8,175 | -1.2% |
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