The following table lists all the named streams that flow in Armstrong County. For each stream, the name, coordinate of the source, name of the stream it flows into, coordinate of the confluence, and political subdivision in which the confluence is located are given.
| Name | Source | Flows into | Mouth | Location | |
|---|---|---|---|---|---|
| 41°52′22″N 77°52′30″W | 40°26′36″N 80°00′54″W | Pittsburgh, Pennsylvania | |||
| Armstrong Run | 41°01′06″N 79°38′18″W | 41°00′43″N 79°36′33″W | Perry Township | ||
| Beers Run | 40°41′01″N 79°31′16″W | Crooked Creek | 40°41′51″N 79°30′17″W | Burrell Township | |
| Big Run | 40°43′25″N 79°39′18″W | 40°40′52″N 79°40′11″W | South Buffalo Township | ||
| Birch Run | 41°01′16″N 79°37′49″W | 41°02′00″N 79°37′09″W | Perry Township | ||
| Brady Run | 40°40′04″N 79°34′39″W | 40°37′57″N 79°36′33″W | Leechburg | ||
| 40°56′46″N 79°47′19″W | 40°40′11″N 79°41′34″W | Freeport | |||
| Bullock Run | 40°54′42″N 79°25′44″W | North Fork Pine Creek | 40°52′48″N 79°26′28″W | Boggs Township | |
| Camp Run | 40°53′40″N 79°17′33″W | 40°55′29″N 79°17′23″W | Wayne Township | ||
| Campbell Run | 40°44′35″N 79°27′02″W | Crooked Creek | 40°43′43″N 79°32′13″W | Manor Township | |
| Carnahan Run | 40°37′50″N 79°28′34″W | 40°36′44″N 79°35′02″W | Parks Township | ||
| Cathcart Run | 40°59′15″N 79°18′06″W | 40°57′25″N 79°18′45″W | Mahoning Township | ||
| Cave Run | 40°55′43″N 79°22′24″W | 40°56′19″N 79°22′19″W | Mahoning Township | ||
| Cessna Run | 40°46′20″N 79°19′32″W | South Branch Plum Creek | 40°42′14″N 79°19′09″W | Plumcreek Township | |
| Cherry Run | 40°44′57″N 79°20′40″W | Crooked Creek | 40°40′25″N 79°27′32″W | Burrell Township | |
| Coal Bank Run | 40°41′22″N 79°31′19″W | Crooked Creek | 40°42′12″N 79°30′41″W | Bethel Township | |
| Cornplanter Run | 40°46′19″N 79°44′06″W | Buffalo Creek | 40°45′16″N 79°40′21″W | South Buffalo Township | |
| Cove Run | 41°00′58″N 79°39′48″W | Sugar Creek | 40°59′15″N 79°38′03″W | Bradys Bend Township | |
| 40°49′34″N 79°10′32″W | 40°51′04″N 79°30′28″W | Gosford | |||
| Craig Run | 40°36′12″N 79°22′30″W | Crooked Creek | 40°38′08″N 79°24′00″W | South Bend Township | |
| Craigs Run | 40°49′40″N 79°18′30″W | 40°47′42″N 79°18′36″W | Rural Valley | ||
| Crooked Creek | 40°41′44″N 79°04′43″W | 40°44′57″N 79°33′18″W | Bethel Township Manor Township | ||
| Deaver Run | 40°52′12″N 79°23′59″W | South Fork Pine Creek | 40°51′08″N 79°25′16″W | Boggs Township Valley Township | |
| Dutch Run | 40°42′29″N 79°14′39″W | Plum Creek | 40°41′12″N 79°19′41″W | Plumcreek Township | |
| Elbow Run | 40°44′06″N 79°27′27″W | Crooked Creek | 40°43′05″N 79°29′43″W | Kittaning Township | |
| Elder Run | 40°41′23″N 79°34′21″W | 40°38′52″N 79°37′33″W | Gilpin Township | ||
| Fagley Run | 40°41′04″N 79°22′48″W | Crooked Creek | 40°39′07″N 79°25′24″W | Burrell Township | |
| Flat Run | 40°34′06″N 79°28′16″W | 40°32′10″N 79°30′17″W | Kiskiminetas Township | ||
| Foundry Run | 40°55′55″N 79°11′20″W | 40°54′37″N 79°13′15″W | Wayne Township | ||
| Garretts Run | 40°45′32″N 79°27′22″W | 40°47′40″N 79°31′02″W | Manor Township | ||
| Glade Run | 40°50′42″N 79°12′23″W | 40°54′53″N 79°15′47″W | Wayne Township | ||
| Glade Run | 40°54′17″N 79°34′24″W | 40°45′08″N 79°34′06″W | Cadogan Township | ||
| Gobblers Run | 40°37′11″N 79°18′39″W | 40°38′03″N 79°21′37″W | South Bend Township | ||
| Guffy Run | 40°40′46″N 79°33′25″W | 40°37′59″N 79°34′54″W | Gilpin Township Parks Township | ||
| Hamilton Run | 40°58′46″N 79°19′44″W | 40°57′00″N 79°19′16″W | Mahoning Township near Putneyville | ||
| Hart Run | 40°57′00″N 79°38′30″W | Sugar Creek | 40°59′16″N 79°37′57″W | Bradys Bend Township | |
| Hays Run | 40°50′29″N 79°26′33″W | 40°51′44″N 79°28′59″W | Rayburn Township | ||
| Hill Run | 40°43′44″N 79°37′55″W | 40°41′41″N 79°37′15″W | South Buffalo Township | ||
| Holder Run | 40°57′43″N 79°40′30″W | Sugar Creek | 40°59′10″N 79°38′16″W | Bradys Bend Township | |
| Horney Camp Run | 40°43′43″N 79°27′09″W | Crooked Creek | 40°42′30″N 79°29′59″W | Burrell Township | |
| Huling Run | 40°54′47″N 79°35′17″W | 40°59′01″N 79°34′32″W | Washington Township | ||
| Huskins Run | 40°45′16″N 79°20′40″W | 40°47′54″N 79°22′14″W | Cowanshannock Township | ||
| Knapp Run | 40°43′39″N 79°38′14″W | 40°41′44″N 79°38′46″W | South Buffalo Township | ||
| 40°29′08″N 79°27′14″W | 40°40′46″N 79°40′01″W | near Freeport, Pennsylvania | |||
| Laurel Run | 40°50′03″N 79°23′05″W | South Fork Pine Creek | 40°50′40″N 79°23′58″W | Boggs Township Valley Township | |
| Limestone Run | 40°54′58″N 79°33′10″W | 40°51′21″N 79°30′28″W | East Franklin Township | ||
| Lindsay Run | 40°36′35″N 79°24′02″W | Crooked Creek | 40°38′05″N 79°24′07″W | South Bend Township | |
| Little Mudlick Creek | 40°59′52″N 79°15′25″W | 40°57′10″N 79°18′09″W | Redbank Township | ||
| 41°01′39″N 78°57′31″W | 41°02′44″N 79°13′48″W | Redbank Township | |||
| Long Run | 40°35′52″N 79°25′26″W | 40°32′00″N 79°28′34″W | Kiskiminetas Township | ||
| Long Run | 40°40′28″N 79°24′38″W | Fagley Run | 40°39′14″N 79°25′14″W | South Bend Township | |
| Long Run | 40°54′31″N 79°35′33″W | Patterson Creek | 40°52′03″N 79°38′15″W | West Franklin Township | |
| Long Run | 40°59′39″N 79°41′54″W | Sugar Creek | 40°58′49″N 79°40′24″W | Bradys Bend Township | |
| Long Run | 40°49′39″N 79°23′15″W | 40°48′34″N 79°24′40″W | Valley Township | ||
| 40°58′26″N 78°51′22″W | 40°55′59″N 79°27′40″W | Madison Township and Pine Township | |||
| Marrowbone Run | 40°46′50″N 79°37′15″W | Buffalo Creek | 40°47′37″N 79°39′06″W | North Buffalo Township | |
| Mast Run | 40°57′47″N 79°31′07″W | 40°56′49″N 79°32′39″W | Madison Township | ||
| Mill Run | 40°45′57″N 79°23′30″W | 40°48′29″N 79°27′47″W | Rayburn Township | ||
| Mudlick Creek | 41°01′14″N 79°13′25″W | Pine Run | 40°57′45″N 79°15′09″W | Redbank Township | |
| Nicholson Run | 40°47′09″N 79°36′19″W | 40°43′34″N 79°35′13″W | South Buffalo Township | ||
| Nolf Run | 41°00′11″N 79°12′24″W | Little Sandy Creek | 41°02′21″N 79°13′06″W | Redbank Township | |
| North Branch Cherry Run | 40°45′21″N 79°26′53″W | Cherry Run | 40°41′08″N 79°25′33″W | Burrell Township | |
| North Branch Plum Creek | 40°49′33″N 79°10′02″W | Keystone Lake | 40°43′13″N 79°18′09″W | Plumcreek Township | |
| North Branch South Fork Pine Creek | 40°51′03″N 79°15′52″W | South Fork Pine Creek | 40°50′58″N 79°19′43″W | Wayne Township near Echo. | |
| North Fork Pine Creek | 40°53′26″N 79°19′48″W | Pine Creek | 40°52′27″N 79°28′06″W | Boggs Township | |
| Nye Branch | 40°56′37″N 79°09′29″W | Sugarcamp Run | 40°57′45″N 79°13′17″W | Redbank Township | |
| Patterson Creek | 40°57′11″N 79°40′51″W | Buffalo Creek | 40°51′06″N 79°38′17″W | West Franklin Township | |
| Pine Creek | 40°52′27″N 79°28′08″W | 40°52′16″N 79°28′41″W | Boggs Township Rayburn Township | ||
| Pine Run | 40°43′04″N 79°26′45″W | Crooked Creek | 40°41′15″N 79°28′28″W | Burrell Township | |
| Pine Run | 41°00′57″N 79°40′32″W | Sugar Creek | 40°59′10″N 79°39′15″W | Bradys Bend Township | |
| Pine Run | 40°46′33″N 79°37′33″W | Buffalo Creek | 40°43′59″N 79°40′46″W | South Buffalo Township | |
| Pine Run | 40°58′10″N 79°06′29″W | 40°56′47″N 79°16′39″W | Redbank Township | ||
| Plum Creek | 40°43′14″N 79°18′09″W | Crooked Creek | 40°39′56″N 79°19′45″W | Plumcreek Township | |
| Rattling Run | 40°36′40″N 79°30′30″W | Roaring Run | 40°33′39″N 79°31′38″W | Kiskiminetas Township | |
| 41°09′30″N 79°04′36″W | 40°58′55″N 79°33′00″W | Madison Township | |||
| Roaring Run | 40°36′18″N 79°26′27″W | 40°33′04″N 79°32′10″W | Kiskiminetas Township | ||
| Rough Run | 40°49′13″N 79°48′14″W | Buffalo Creek | 40°47′05″N 79°41′16″W | North Buffalo Township | |
| Rupp Run | 40°46′25″N 79°26′39″W | Garretts Run | 40°47′03″N 79°29′42″W | Manor Township | |
| Scrubgrass Creek | 40°54′45″N 79°19′29″W | 40°55′33″N 79°25′26″W | Mahoning Station, Pine Township | ||
| Sipes Run | 40°47′09″N 79°40′28″W | Buffalo Creek | 40°46′09″N 79°40′22″W | South Buffalo Township | |
| Snyders Run | 40°56′28″N 79°35′48″W | 40°58′12″N 79°35′22″W | Bradys Bend Township | ||
| South Branch Cowanshannock Creek | 40°49′15″N 79°10′40″W | 40°47′51″N 79°15′55″W | Cowanshannock Township | ||
| South Branch Plum Creek | 40°47′13″N 79°04′34″W | Plum Creek | 40°43′13″N 79°18′09″W | Plumcreek Township | |
| South Branch South Fork Pine Creek | 40°49′13″N 79°16′33″W | South Fork Pine Creek | 40°50′58″N 79°19′43″W | Wayne Township | |
| South Fork Pine Creek | 40°50′58″N 79°19′42″W | Pine Creek | 40°52′27″N 79°28′06″W | Rayburn Township | |
| Spra Run | 40°45′54″N 79°23′04″W | 40°48′39″N 79°25′08″W | Valley Township | ||
| Spruce Run | 40°51′03″N 79°14′26″W | 40°49′01″N 79°14′41″W | Cowanshannock Township | ||
| Spur Run | 40°40′55″N 79°33′17″W | Taylor Run | 40°42′08″N 79°33′22″W | Bethel Township | |
| Sugar Creek | 40°58′11″N 79°42′33″W | 40°59′31″N 79°36′49″W | Bradys Bend Township | ||
| Sugar Run | 40°40′39″N 79°22′39″W | Crooked Creek | 40°38′15″N 79°24′18″W | South Bend Township | |
| Sugarcamp Run | 40°59′40″N 79°13′05″W | Mudlick Creek | 40°57′43″N 79°14′13″W | Redbank Township | |
| Taylor Run | 40°40′37″N 79°31′38″W | 40°42′28″N 79°34′49″W | Bethel Township | ||
| Tub Mill Run | 40°45′43″N 79°30′36″W | 40°45′23″N 79°32′50″W | Manor Township | ||
| Watson Run | 40°43′24″N 79°37′22″W | 40°42′07″N 79°36′19″W | South Buffalo Township | ||
| Whiskey Run | 41°00′52″N 79°38′28″W | Sugar Creek | 40°59′57″N 79°37′28″W | Bradys Bend Township | |
| Wiskey Creek | 40°55′06″N 79°26′06″W | 40°55′12″N 79°27′48″W | Pine Township |