| Name | Number | Bank | Mouth | Political subdivision | Source | Political subdivision |
| West Branch Clarion River[1] |
1 |
Right |
41°29′29″N 78°40′42″W (elev. 1,437 feet (438 m)) |
Johnsonburg, Pennsylvania |
41°43′08″N 78°38′48″W |
Mount Jewett, Pennsylvania |
| East Branch Clarion River[2] |
2 |
Left |
41°29′29″N 78°40′41″W (elev. 1,440 feet (440 m)) |
Johnsonburg, Pennsylvania |
41°40′33″N 78°29′07″W |
Sergeant Township, McKean County |
| Johnson Run[3] |
3 |
Right |
41°29′20″N 78°40′42″W (elev. 1,437 feet (438 m)) |
Johnsonburg, Pennsylvania |
41°30′00″N 78°42′25″W |
Ridgway Township, Elk County |
| Powers Run[4] |
4 |
Left |
41°28′46″N 78°40′19″W (elev. 1,424 feet (434 m)) |
Johnsonburg, Pennsylvania |
41°29′40″N 78°33′25″W |
St. Marys, Pennsylvania |
| Riley Run[5] |
5 |
Right |
41°27′14″N 78°42′31″W (elev. 1,414 feet (431 m)) |
Ridgway Township, Elk County |
41°28′22″N 78°41′53″W |
Ridgway Township, Elk County |
| Little Mill Creek[6] |
6 |
Right |
41°27′12″N 78°43′12″W (elev. 1,381 feet (421 m)) |
Ridgway Township, Elk County |
41°33′25″N 78°45′29″W |
Jones Township, Elk County |
| Mason Creek[7] |
7 |
Right |
41°26′20″N 78°43′54″W (elev. 1,371 feet (418 m)) |
Ridgway Township, Elk County |
41°28′12″N 78°45′52″W |
Ridgway Township, Elk County |
| Elk Creek[8] |
8 |
Left |
41°25′18″N 78°44′03″W (elev. 1,362 feet (415 m)) |
Ridgway, Pennsylvania |
41°28′49″N 78°33′57″W |
St. Marys, Pennsylvania |
| Island Run[9] |
9 |
Left |
41°23′50″N 78°45′09″W (elev. 1,348 feet (411 m)) |
Ridgway Township, Elk County |
41°23′53″N 78°45′06″W |
Ridgway Township, Elk County |
| Big Mill Creek[10] |
10 |
Right |
41°23′44″N 78°45′46″W (elev. 1,342 feet (409 m)) |
Ridgway Township, Elk County |
41°35′55″N 78°47′34″W |
Jones Township, Elk County |
| Connerville Run[11] |
11 |
Right |
41°22′49″N 78°46′59″W (elev. 1,332 feet (406 m)) |
Ridgway Township, Elk County |
41°23′46″N 78°47′39″W |
Ridgway Township, Elk County |
| Dog Hollow Run[12] |
12 |
Left |
41°22′26″N 78°47′32″W (elev. 1,325 feet (404 m)) |
Ridgway Township, Elk County |
41°21′43″N 78°45′22″W |
Ridgway Township, Elk County |
| Gillis Run[13] |
13 |
Right |
41°22′29″N 78°48′43″W (elev. 1,329 feet (405 m)) |
Ridgway Township, Elk County |
41°23′13″N 78°48′12″W |
Ridgway Township, Elk County |
| Little Toby Creek[14] |
14 |
Left |
41°21′59″N 78°49′25″W (elev. 1,322 feet (403 m)) |
Spring Creek Township, Elk County |
41°19′55″N 78°36′32″W |
Fox Township, Elk County, Pennsylvania |
| Bear Creek[15] |
15 |
Right |
41°22′53″N 78°49′53″W (elev. 1,335 feet (407 m)) |
Spring Creek Township, Elk County |
41°34′04″N 78°49′05″W |
Highland Township, Elk County |
| Mahood Run[16] |
16 |
Left |
41°22′24″N 78°51′03″W (elev. 1,302 feet (397 m)) |
Spring Creek Township, Elk County |
41°21′12″N 78°50′43″W |
Spring Creek Township, Elk County |
| Beech Bottom Run[17] |
17 |
Left |
41°23′21″N 78°52′30″W (elev. 1,289 feet (393 m)) |
Spring Creek Township, Elk County |
41°20′41″N 78°51′16″W |
Spring Creek Township, Elk County |
| Lake City Run[18] |
18 |
Left |
41°23′21″N 78°52′34″W (elev. 1,283 feet (391 m)) |
Spring Creek Township, Elk County |
41°22′06″N 78°53′28″W |
Spring Creek Township, Elk County |
| Crow Run[19] |
19 |
Right |
41°23′53″N 78°53′09″W (elev. 1,276 feet (389 m)) |
Spring Creek Township, Elk County |
41°26′08″N 78°51′27″W |
Spring Creek Township, Elk County |
| Irwin Run[20] |
20 |
Right |
41°24′00″N 78°54′19″W (elev. 1,276 feet (389 m)) |
Spring Creek Township, Elk County |
41°26′56″N 78°52′41″W |
Spring Creek Township, Elk County |
| Spring Creek[21] |
21 |
Right |
41°24′02″N 78°55′57″W (elev. 1,257 feet (383 m)) |
Spring Creek Township, Elk County |
41°32′23″N 79°01′40″W |
Howe Township, Forest County |
| Maxwell Run[22] |
22 |
Left |
41°23′04″N 78°56′05″W (elev. 1,250 feet (380 m)) |
Spring Creek Township, Elk County |
41°19′03″N 78°51′15″W |
Spring Creek Township, Elk County |
| Elliott Run[23] |
23 |
Right |
41°22′57″N 78°56′37″W (elev. 1,257 feet (383 m)) |
Spring Creek Township, Elk County |
41°23′38″N 78°57′45″W |
Millstone Township, Elk County |
| Daugherty Run[24] |
24 |
Left |
41°22′11″N 78°57′38″W (elev. 1,253 feet (382 m)) |
Heath Township, Jefferson County |
41°21′27″N 78°56′22″W |
Spring Creek Township, Elk County |
| Raught Run[25] |
25 |
Left |
41°22′10″N 78°57′50″W (elev. 1,240 feet (380 m)) |
Heath Township, Jefferson County |
41°20′10″N 78°58′00″W |
Heath Township, Jefferson County |
| Painter Run[26] |
26 |
|
41°22′18″N 78°58′01″W (elev. 1,237 feet (377 m)) |
Heath Township, Jefferson County |
41°23′17″N 78°58′02″W |
Millstone Township, Elk County |
| Church Run[27] |
27 |
Right |
41°22′35″N 78°58′24″W (elev. 1,243 feet (379 m)) |
Millstone Township, Elk County |
41°24′06″N 78°59′21″W |
Millstone Township, Elk County |
| Clyde Run[28] |
28 |
Right |
41°22′23″N 78°58′34″W (elev. 1,230 feet (370 m)) |
Heath Township, Jefferson County |
41°22′58″N 78°59′27″W |
Millstone Township, Elk County |
| Callen Run[29] |
29 |
Left |
41°21′01″N 79°00′54″W (elev. 1,240 feet (380 m)) |
Heath Township, Jefferson County |
41°18′50″N 78°57′43″W |
Polk Township, Jefferson County |
| Cline Run[30] |
30 |
Right |
41°21′26″N 79°01′37″W (elev. 1,237 feet (377 m)) |
Millstone Township, Elk County |
41°22′54″N 79°00′32″W |
Millstone Township, Elk County |
| Wyncoop Run[31] |
31 |
Right |
41°21′26″N 79°02′15″W (elev. 1,207 feet (368 m)) |
Heath Township, Jefferson County |
41°24′08″N 79°00′12″W |
Millstone Township, Elk County |
| Leeper Run[32] |
32 |
Left |
41°21′16″N 79°02′32″W (elev. 1,224 feet (373 m)) |
Heath Township, Jefferson County |
41°20′06″N 79°01′59″W |
Heath Township, Jefferson County |
| Pine Run[33] |
33 |
Left |
41°21′00″N 79°03′35″W (elev. 1,207 feet (368 m)) |
Heath Township, Jefferson County |
41°19′51″N 79°02′44″W |
Heath Township, Jefferson County |
| Millstone Creek[34] |
34 |
Right |
41°21′13″N 79°04′17″W (elev. 1,207 feet (368 m)) |
Millstone Township, Elk County |
41°22′25″N 79°05′02″W |
Millstone Township, Elk County |
| Shippen Run[35] |
35 |
Right |
41°20′33″N 79°05′57″W (elev. 1,197 feet (365 m)) |
Barnett Township, Forest County |
41°22′07″N 79°06′00″W |
Barnett Township, Forest County |
| Clear Creek[36] |
36 |
Left |
41°19′46″N 79°06′12″W (elev. 1,194 feet (364 m)) |
Barnett Township, Jefferson County |
41°19′09″N 79°00′28″W |
Heath Township, Jefferson County |
| Tadler Run[37] |
37 |
Left |
41°19′49″N 79°07′28″W (elev. 1,194 feet (364 m)) |
Barnett Township, Jefferson County |
41°18′41″N 79°06′57″W |
Barnett Township, Jefferson County |
| Cherry Run[38] |
38 |
Right |
41°19′59″N 79°07′32″W (elev. 1,207 feet (368 m)) |
Barnett Township, Forest County |
41°22′37″N 79°08′02″W |
Barnett Township, Forest County |
| Maple Creek[39] |
39 |
Right |
41°20′29″N 79°08′18″W (elev. 1,178 feet (359 m)) |
Barnett Township, Jefferson County |
41°27′12″N 79°08′21″W |
Jenks Township, Forest County, Pennsylvania |
| Coleman Run[40] |
40 |
Right |
41°20′38″N 79°09′56″W (elev. 1,184 feet (361 m)) |
Barnett Township, Forest County |
41°22′42″N 79°12′39″W |
Farmington Township, Clarion County |
| Troutman Run[41] |
41 |
Right |
41°20′20″N 79°11′05″W (elev. 1,161 feet (354 m)) |
Barnett Township, Jefferson County |
41°21′19″N 79°12′01″W |
Barnett Township, Forest County |
| Henry Run[42] |
42 |
Right |
41°19′27″N 79°11′31″W (elev. 1,155 feet (352 m)) |
Barnett Township, Jefferson County |
41°20′20″N 79°12′12″W |
Barnett Township, Forest County |
| Toms Run[43] |
43 |
Right |
41°19′55″N 79°12′25″W (elev. 1,158 feet (353 m)) |
Barnett Township, Forest County |
41°24′41″N 79°14′20″W |
Farmington Township, Clarion County |
| Henry Run[44] |
44 |
Right |
41°19′15″N 79°13′36″W (elev. 1,145 feet (349 m)) |
Farmington Township, Clarion County |
41°21′17″N 79°15′06″W |
Farmington Township, Clarion County |
| Cathers Run[45] |
45 |
Left |
41°19′00″N 79°14′01″W (elev. 1,138 feet (347 m)) |
Millcreek Township, Clarion County |
41°15′00″N 79°06′59″W |
Eldred Township, Jefferson County |
| Watson Run[46] |
46 |
Right |
41°18′32″N 79°15′26″W (elev. 1,122 feet (342 m)) |
Farmington Township, Clarion County |
41°19′49″N 79°16′04″W |
Farmington Township, Clarion County |
| Maxwell Run[47] |
47 |
Left |
41°17′30″N 79°16′08″W (elev. 1,125 feet (343 m)) |
Millcreek Township, Clarion County |
41°17′20″N 79°13′45″W |
Millcreek Township, Clarion County |
| Callihan Run[48] |
48 |
Right |
41°16′48″N 79°17′42″W (elev. 1,102 feet (336 m)) |
Highland Township, Clarion County |
41°18′36″N 79°17′05″W |
Highland Township, Clarion County |
| Blyson Run[49] |
49 |
Left |
41°16′07″N 79°18′09″W (elev. 1,096 feet (334 m)) |
Millcreek Township, Clarion County |
41°16′03″N 79°14′38″W |
Millcreek Township, Clarion County |
| McGourvey Run[50] |
50 |
Right |
41°14′34″N 79°18′47″W (elev. 1,089 feet (332 m)) |
Millcreek Township, Clarion County |
41°16′13″N 79°19′35″W |
Highland Township, Clarion County |
| Mill Creek[51] |
51 |
Left |
41°14′08″N 79°19′16″W (elev. 1,089 feet (332 m)) |
Millcreek Township, Clarion County |
41°15′32″N 79°06′35″W |
Eldred Township, Jefferson County |
| Reed Run[52] |
52 |
Right |
41°13′36″N 79°20′19″W (elev. 1,089 feet (332 m)) |
Highland Township, Clarion County |
41°14′58″N 79°20′36″W |
Highland Township, Clarion County |
| Toby Creek[53] |
53 |
Right |
41°13′35″N 79°23′24″W (elev. 1,089 feet (332 m)) |
Highland Township, Clarion County |
41°23′18″N 79°16′51″W |
Farmington Township, Clarion County |
| Trout Run[54] |
54 |
Left |
41°12′08″N 79°24′22″W (elev. 1,093 feet (333 m)) |
Monroe Township, Clarion County |
41°11′40″N 79°22′19″W |
Clarion Township, Clarion County |
| Courtleys Run[55] |
55 |
Left |
41°11′20″N 79°24′43″W (elev. 1,119 feet (341 m)) |
Monroe Township, Clarion County |
41°11′25″N 79°23′16″W |
Monroe Township, Clarion County |
| Piney Reservoir[56] |
56 |
|
41°11′30″N 79°26′05″W (elev. 1,053 feet (321 m)) |
Piney Township, Clarion County |
|
|
| Piney Dam[57] |
57 |
|
41°11′32″N 79°26′01″W (elev. 1,056 feet (322 m)) |
Paint Township, Clarion County |
|
|
| Piney Creek[58] |
58 |
Left |
41°10′10″N 79°28′24″W (elev. 997 feet (304 m)) |
Piney Township, Clarion County |
41°09′44″N 79°14′09″W |
Limestone Township, Clarion County, Pennsylvania |
| Deer Creek[59] |
59 |
Right |
41°10′18″N 79°28′44″W (elev. 997 feet (304 m)) |
Beaver Township, Clarion County |
41°17′16″N 79°31′46″W |
Ashland Township, Clarion County |
| Canoe Creek[60] |
60 |
Right |
41°09′44″N 79°31′58″W (elev. 984 feet (300 m)) |
Beaver Township, Clarion County |
41°16′28″N 79°33′54″W |
Ashland Township, Clarion County |
| Beaver Creek[61] |
61 |
Right |
41°09′37″N 79°32′50″W (elev. 978 feet (298 m)) |
Licking Township, Clarion County |
41°15′56″N 79°35′03″W |
Ashland Township, Clarion County |
| Licking Creek[62] |
62 |
Left |
41°07′44″N 79°33′35″W (elev. 958 feet (292 m)) |
Licking Township, Clarion County |
41°03′55″N 79°26′12″W |
Porter Township, Clarion County |
| Turkey Run[63] |
63 |
Right |
41°09′12″N 79°37′50″W (elev. 892 feet (272 m)) |
Richland Township, Clarion County |
41°14′35″N 79°36′21″W |
Salem Township, Clarion County |