Cities, Towns, Neighborhoods & Other Populated Places in Armstrong County.
| City Name | Title | County | Population |
|---|---|---|---|
| Milton | Borough in northwestern Northumberland County, Pennsylvania | 6,595 | |
| North Buffalo | Township of Pennsylvania | 2,889 | |
| Ford City | Borough of Pennsylvania | 2,764 | |
| Kittanning | Borough of Pennsylvania | 2,153 | |
| Apollo | Borough of Pennsylvania | 1,523 | |
| North Apollo | Borough of Pennsylvania | 1,201 | |
| Williamsburg | Borough of Pennsylvania | 1,177 | |
| South Bend | Township in Armstrong County, Pennsylvania | 1,097 | |
| West Kittanning | Borough of Pennsylvania | 1,090 | |
| Adams | Community in Armstrong County, Pennsylvania, United States | 912 | |
| Rural Valley | Borough of Pennsylvania | 814 | |
| Bradys Bend | Township in Armstrong County, Pennsylvania | 714 | |
| Brownstown | Borough in Cambria County, Pennsylvania | 677 | |
| Greenville | Borough in Mercer County, Pennsylvania, United States | 632 | |
| Parker | City in Armstrong County, Pennsylvania | 608 | |
| Worthington | Borough of Pennsylvania | 589 | |
| South Bethlehem | Borough of Pennsylvania | 447 | |
| Manorville | Borough of Pennsylvania | 385 | |
| Ford Cliff | Borough of Pennsylvania | 350 | |
| Elderton | Borough of Pennsylvania | 335 | |
| Cadogan | Township in Armstrong County, Pennsylvania | 328 | |
| Applewold | Borough of Pennsylvania | 286 | |
| Freeport | Borough of Pennsylvania | 280 | |
| Atwood | Borough of Pennsylvania | 103 |