Counties with the highest STI rates in Pennsylvania

Emma Rubin // Stacker
- Chlamydia cases: 421.3 per 100K (#34 nationally, 54,645 cases)
- Gonorrhea cases: 145.3 per 100K (#32 nationally, 18,851 cases)
- Primary and secondary syphilis cases: 10.8 per 100K (#39 nationally, 1,397 cases)
State-level statistics
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- Chlamydia cases: 157.5 per 100K people (41 case)
- Gonorrhea cases: 26.9 per 100K people (7 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#50. Wyoming County
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- Chlamydia cases: 175.4 per 100K people (54 cases)
- Gonorrhea cases: 6.5 per 100K people (2 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#49. Elk County
Sabrina Janelle Gordon // Shutterstock
- Chlamydia cases: 183.2 per 100K people (356 cases)
- Gonorrhea cases: 40.1 per 100K people (78 cases)
- Syphilis cases (non-congenital): 5.7 per 100K people (11 case)
--- Primary and secondary syphilis: 3.6 per 100K people (7 cases)
--- Nonprimary and nonsecondary early syphilis: 2.1 per 100K people (4 cases)
#48. Butler County
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- Chlamydia cases: 192.6 per 100K people (82 cases)
- Gonorrhea cases: 18.8 per 100K people (8 cases)
- Syphilis cases (non-congenital): 7.0 per 100K people (3 cases)
--- Primary and secondary syphilis: 7.0 per 100K people (3 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#47. Union County
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- Chlamydia cases: 192.6 per 100K people (126 cases)
- Gonorrhea cases: 56.6 per 100K people (37 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#46. Carbon County
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- Chlamydia cases: 193.2 per 100K people (161 case)
- Gonorrhea cases: 56.4 per 100K people (47 cases)
- Syphilis cases (non-congenital): 3.6 per 100K people (3 cases)
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 3.6 per 100K people (3 cases)
#45. Crawford County
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- Chlamydia cases: 195.7 per 100K people (691 case)
- Gonorrhea cases: 48.4 per 100K people (171 case)
- Syphilis cases (non-congenital): 3.4 per 100K people (12 cases)
--- Primary and secondary syphilis: 1.1 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: 2.3 per 100K people (8 cases)
#44. Westmoreland County
Alejandro Guzmani // Shutterstock
- Chlamydia cases: 199.7 per 100K people (29 cases)
- Gonorrhea cases: 20.7 per 100K people (3 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#43. Fulton County
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- Chlamydia cases: 201.7 per 100K people (210 cases)
- Gonorrhea cases: 45.1 per 100K people (47 cases)
- Syphilis cases (non-congenital): 1.9 per 100K people (2 cases)
--- Primary and secondary syphilis: 1.0 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 1.0 per 100K people (1 case)
#42. Adams County
eric scott gillin // Shutterstock
- Chlamydia cases: 201.8 per 100K people (9 cases)
- Gonorrhea cases: 44.9 per 100K people (2 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#41. Cameron County
LittleKitty // Shutterstock
- Chlamydia cases: 202.7 per 100K people (1,092 cases)
- Gonorrhea cases: 45.5 per 100K people (245 cases)
- Syphilis cases (non-congenital): 11.3 per 100K people (61 case)
--- Primary and secondary syphilis: 6.3 per 100K people (34 cases)
--- Nonprimary and nonsecondary early syphilis: 5.0 per 100K people (27 cases)
#40. Chester County
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- Chlamydia cases: 202.8 per 100K people (81 case)
- Gonorrhea cases: 70.1 per 100K people (28 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#39. Mckean County
George Sheldon // Shutterstock
- Chlamydia cases: 203.7 per 100K people (94 cases)
- Gonorrhea cases: 6.5 per 100K people (3 cases)
- Syphilis cases (non-congenital): 6.5 per 100K people (3 cases)
--- Primary and secondary syphilis: 6.5 per 100K people (3 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#38. Mifflin County
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- Chlamydia cases: 207.2 per 100K people (77 cases)
- Gonorrhea cases: 21.5 per 100K people (8 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#37. Clarion County
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- Chlamydia cases: 208.2 per 100K people (78 cases)
- Gonorrhea cases: 37.4 per 100K people (14 cases)
- Syphilis cases (non-congenital): 5.3 per 100K people (2 cases)
--- Primary and secondary syphilis: 2.7 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 2.7 per 100K people (1 case)
#36. Clinton County
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- Chlamydia cases: 213.7 per 100K people (128 cases)
- Gonorrhea cases: 36.7 per 100K people (22 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#35. Bradford County
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- Chlamydia cases: 214.2 per 100K people (1,384 cases)
- Gonorrhea cases: 51.5 per 100K people (333 cases)
- Syphilis cases (non-congenital): 13.5 per 100K people (87 cases)
--- Primary and secondary syphilis: 6.5 per 100K people (42 cases)
--- Nonprimary and nonsecondary early syphilis: 7.0 per 100K people (45 cases)
#34. Bucks County
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- Chlamydia cases: 217.2 per 100K people (455 cases)
- Gonorrhea cases: 69.7 per 100K people (146 cases)
- Syphilis cases (non-congenital): 3.3 per 100K people (7 cases)
--- Primary and secondary syphilis: 1.0 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 2.4 per 100K people (5 cases)
#33. Washington County
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- Chlamydia cases: 223.7 per 100K people (1,925 cases)
- Gonorrhea cases: 64.1 per 100K people (552 cases)
- Syphilis cases (non-congenital): 6.3 per 100K people (54 cases)
--- Primary and secondary syphilis: 2.8 per 100K people (24 cases)
--- Nonprimary and nonsecondary early syphilis: 3.5 per 100K people (30 cases)
#32. Montgomery County
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- Chlamydia cases: 242.1 per 100K people (320 cases)
- Gonorrhea cases: 65.1 per 100K people (86 cases)
- Syphilis cases (non-congenital): 4.5 per 100K people (6 cases)
--- Primary and secondary syphilis: 4.5 per 100K people (6 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#31. Cambria County
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- Chlamydia cases: 246.5 per 100K people (225 cases)
- Gonorrhea cases: 35.1 per 100K people (32 cases)
- Syphilis cases (non-congenital): 8.8 per 100K people (8 cases)
--- Primary and secondary syphilis: 7.7 per 100K people (7 cases)
--- Nonprimary and nonsecondary early syphilis: 1.1 per 100K people (1 case)
#30. Northumberland County
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- Chlamydia cases: 247.3 per 100K people (1,369 cases)
- Gonorrhea cases: 62.1 per 100K people (344 cases)
- Syphilis cases (non-congenital): 15.9 per 100K people (88 cases)
--- Primary and secondary syphilis: 10.5 per 100K people (58 cases)
--- Nonprimary and nonsecondary early syphilis: 5.4 per 100K people (30 cases)
#29. Lancaster County
Scenic Corner // Shutterstock
- Chlamydia cases: 248.8 per 100K people (45 cases)
- Gonorrhea cases: 38.7 per 100K people (7 cases)
- Syphilis cases (non-congenital): 27.6 per 100K people (5 cases)
--- Primary and secondary syphilis: 11.1 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 16.6 per 100K people (3 cases)
#28. Montour County
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- Chlamydia cases: 259.7 per 100K people (114 cases)
- Gonorrhea cases: 31.9 per 100K people (14 cases)
- Syphilis cases (non-congenital): 4.6 per 100K people (2 cases)
--- Primary and secondary syphilis: 4.6 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#27. Huntingdon County
Bennekom // Shutterstock
- Chlamydia cases: 264.5 per 100K people (379 cases)
- Gonorrhea cases: 66.3 per 100K people (95 cases)
- Syphilis cases (non-congenital): 16.8 per 100K people (24 cases)
--- Primary and secondary syphilis: 9.8 per 100K people (14 cases)
--- Nonprimary and nonsecondary early syphilis: 7.0 per 100K people (10 cases)
#26. Schuylkill County
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- Chlamydia cases: 267.0 per 100K people (702 cases)
- Gonorrhea cases: 69.6 per 100K people (183 cases)
- Syphilis cases (non-congenital): 8.0 per 100K people (21 case)
--- Primary and secondary syphilis: 5.7 per 100K people (15 cases)
--- Nonprimary and nonsecondary early syphilis: 2.3 per 100K people (6 cases)
#25. Cumberland County
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- Chlamydia cases: 270.3 per 100K people (135 cases)
- Gonorrhea cases: 28.0 per 100K people (14 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#24. Venango County
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- Chlamydia cases: 270.3 per 100K people (583 cases)
- Gonorrhea cases: 88.1 per 100K people (190 cases)
- Syphilis cases (non-congenital): 8.8 per 100K people (19 cases)
--- Primary and secondary syphilis: 2.3 per 100K people (5 cases)
--- Nonprimary and nonsecondary early syphilis: 6.5 per 100K people (14 cases)
#23. Lackawanna County
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- Chlamydia cases: 288.5 per 100K people (414 cases)
- Gonorrhea cases: 39.0 per 100K people (56 cases)
- Syphilis cases (non-congenital): 8.4 per 100K people (12 cases)
--- Primary and secondary syphilis: 5.6 per 100K people (8 cases)
--- Nonprimary and nonsecondary early syphilis: 2.8 per 100K people (4 cases)
#22. Lebanon County
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- Chlamydia cases: 296.5 per 100K people (361 case)
- Gonorrhea cases: 40.2 per 100K people (49 cases)
- Syphilis cases (non-congenital): 2.5 per 100K people (3 cases)
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 2.5 per 100K people (3 cases)
#21. Blair County
Mark Rust // Shutterstock
- Chlamydia cases: 301.6 per 100K people (250 cases)
- Gonorrhea cases: 47.1 per 100K people (39 cases)
- Syphilis cases (non-congenital): 7.2 per 100K people (6 cases)
--- Primary and secondary syphilis: 2.4 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 4.8 per 100K people (4 cases)
#20. Indiana County
Orlowski Designs LLC // Shutterstock
- Chlamydia cases: 304.9 per 100K people (508 cases)
- Gonorrhea cases: 97.2 per 100K people (162 cases)
- Syphilis cases (non-congenital): 7.8 per 100K people (13 cases)
--- Primary and secondary syphilis: 4.8 per 100K people (8 cases)
--- Nonprimary and nonsecondary early syphilis: 3.0 per 100K people (5 cases)
#19. Beaver County
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- Chlamydia cases: 323.8 per 100K people (506 cases)
- Gonorrhea cases: 73.6 per 100K people (115 cases)
- Syphilis cases (non-congenital): 8.3 per 100K people (13 cases)
--- Primary and secondary syphilis: 5.1 per 100K people (8 cases)
--- Nonprimary and nonsecondary early syphilis: 3.2 per 100K people (5 cases)
#18. Franklin County
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- Chlamydia cases: 328.3 per 100K people (213 cases)
- Gonorrhea cases: 44.7 per 100K people (29 cases)
- Syphilis cases (non-congenital): 4.6 per 100K people (3 cases)
--- Primary and secondary syphilis: 3.1 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 1.5 per 100K people (1 case)
#17. Columbia County
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- Chlamydia cases: 331.6 per 100K people (1,040 cases)
- Gonorrhea cases: 97.9 per 100K people (307 cases)
- Syphilis cases (non-congenital): 13.4 per 100K people (42 cases)
--- Primary and secondary syphilis: 4.8 per 100K people (15 cases)
--- Nonprimary and nonsecondary early syphilis: 8.6 per 100K people (27 cases)
#16. Northampton County
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- Chlamydia cases: 334.0 per 100K people (424 cases)
- Gonorrhea cases: 86.7 per 100K people (110 cases)
- Syphilis cases (non-congenital): 10.2 per 100K people (13 cases)
--- Primary and secondary syphilis: 5.5 per 100K people (7 cases)
--- Nonprimary and nonsecondary early syphilis: 4.7 per 100K people (6 cases)
#15. Fayette County
The American Explorer // Shutterstock
- Chlamydia cases: 350.9 per 100K people (300 cases)
- Gonorrhea cases: 94.7 per 100K people (81 case)
- Syphilis cases (non-congenital): 4.7 per 100K people (4 cases)
--- Primary and secondary syphilis: 2.3 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 2.3 per 100K people (2 cases)
#14. Lawrence County
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- Chlamydia cases: 353.0 per 100K people (556 cases)
- Gonorrhea cases: 38.1 per 100K people (60 cases)
- Syphilis cases (non-congenital): 7.6 per 100K people (12 cases)
--- Primary and secondary syphilis: 3.8 per 100K people (6 cases)
--- Nonprimary and nonsecondary early syphilis: 3.8 per 100K people (6 cases)
#13. Centre County
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- Chlamydia cases: 354.5 per 100K people (600 cases)
- Gonorrhea cases: 94.5 per 100K people (160 cases)
- Syphilis cases (non-congenital): 9.5 per 100K people (16 cases)
--- Primary and secondary syphilis: 4.1 per 100K people (7 cases)
--- Nonprimary and nonsecondary early syphilis: 5.3 per 100K people (9 cases)
#12. Monroe County
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- Chlamydia cases: 356.7 per 100K people (1,636 cases)
- Gonorrhea cases: 120.8 per 100K people (554 cases)
- Syphilis cases (non-congenital): 10.0 per 100K people (46 cases)
--- Primary and secondary syphilis: 6.3 per 100K people (29 cases)
--- Nonprimary and nonsecondary early syphilis: 3.7 per 100K people (17 cases)
#11. York County
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- Chlamydia cases: 368.3 per 100K people (405 cases)
- Gonorrhea cases: 147.3 per 100K people (162 cases)
- Syphilis cases (non-congenital): 4.5 per 100K people (5 cases)
--- Primary and secondary syphilis: 3.6 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: .9 per 100K people (1 case)
#10. Mercer County
George Sheldon // Shutterstock
- Chlamydia cases: 380.3 per 100K people (432 cases)
- Gonorrhea cases: 147.0 per 100K people (167 cases)
- Syphilis cases (non-congenital): 6.2 per 100K people (7 cases)
--- Primary and secondary syphilis: 3.5 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: 2.6 per 100K people (3 cases)
#9. Lycoming County
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- Chlamydia cases: 392.0 per 100K people (1,278 cases)
- Gonorrhea cases: 104.0 per 100K people (339 cases)
- Syphilis cases (non-congenital): 11.7 per 100K people (38 cases)
--- Primary and secondary syphilis: 8.9 per 100K people (29 cases)
--- Nonprimary and nonsecondary early syphilis: 2.8 per 100K people (9 cases)
#8. Luzerne County
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- Chlamydia cases: 440.1 per 100K people (1,184 cases)
- Gonorrhea cases: 259.5 per 100K people (698 cases)
- Syphilis cases (non-congenital): 17.8 per 100K people (48 cases)
--- Primary and secondary syphilis: 9.7 per 100K people (26 cases)
--- Nonprimary and nonsecondary early syphilis: 8.2 per 100K people (22 cases)
#7. Erie County
ESB Professional // Shutterstock
- Chlamydia cases: 461.8 per 100K people (5,717 cases)
- Gonorrhea cases: 193.8 per 100K people (2,399 cases)
- Syphilis cases (non-congenital): 27.4 per 100K people (339 cases)
--- Primary and secondary syphilis: 11.2 per 100K people (139 cases)
--- Nonprimary and nonsecondary early syphilis: 16.2 per 100K people (200 cases)
#6. Allegheny County
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- Chlamydia cases: 467.3 per 100K people (1,755 cases)
- Gonorrhea cases: 133.7 per 100K people (502 cases)
- Syphilis cases (non-congenital): 14.9 per 100K people (56 cases)
--- Primary and secondary syphilis: 6.1 per 100K people (23 cases)
--- Nonprimary and nonsecondary early syphilis: 8.8 per 100K people (33 cases)
#5. Lehigh County
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- Chlamydia cases: 468.4 per 100K people (2,011 case)
- Gonorrhea cases: 96.2 per 100K people (413 cases)
- Syphilis cases (non-congenital): 17.2 per 100K people (74 cases)
--- Primary and secondary syphilis: 8.2 per 100K people (35 cases)
--- Nonprimary and nonsecondary early syphilis: 9.1 per 100K people (39 cases)
#4. Berks County
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- Chlamydia cases: 478.9 per 100K people (2,748 cases)
- Gonorrhea cases: 186.3 per 100K people (1,069 cases)
- Syphilis cases (non-congenital): 32.6 per 100K people (187 cases)
--- Primary and secondary syphilis: 12.9 per 100K people (74 cases)
--- Nonprimary and nonsecondary early syphilis: 19.7 per 100K people (113 cases)
#3. Delaware County
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- Chlamydia cases: 617.6 per 100K people (1,775 cases)
- Gonorrhea cases: 267.6 per 100K people (769 cases)
- Syphilis cases (non-congenital): 30.3 per 100K people (87 cases)
--- Primary and secondary syphilis: 17.0 per 100K people (49 cases)
--- Nonprimary and nonsecondary early syphilis: 13.2 per 100K people (38 cases)
#2. Dauphin County
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- Chlamydia cases: 1,089.0 per 100K people (17,165 cases)
- Gonorrhea cases: 496.4 per 100K people (7,824 cases)
- Syphilis cases (non-congenital): 83.4 per 100K people (1,315 cases)
--- Primary and secondary syphilis: 37.2 per 100K people (586 cases)
--- Nonprimary and nonsecondary early syphilis: 46.2 per 100K people (729 cases)

This story features data reporting and writing by Emma Rubin and is part of a series utilizing data automation across 49 states.

#1. Philadelphia County
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