Counties with the highest STI rates in Missouri

Emma Rubin // Stacker
- Chlamydia cases: 523.6 per 100K (#15 nationally, 32,346 cases)
- Gonorrhea cases: 246.2 per 100K (#9 nationally, 15,209 cases)
- Primary and secondary syphilis cases: 23.5 per 100K (#13 nationally, 1,454 cases)
State-level statistics
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- Chlamydia cases: 284.2 per 100K people (30 cases)
- Gonorrhea cases: 66.3 per 100K people (7 cases)
- Syphilis cases (non-congenital): 9.5 per 100K people (1 case)
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 9.5 per 100K people (1 case)
#50. Bollinger County
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- Chlamydia cases: 285.2 per 100K people (29 cases)
- Gonorrhea cases: 137.7 per 100K people (14 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#49. Howard County
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- Chlamydia cases: 286.7 per 100K people (10 cases)
- Gonorrhea cases: 57.3 per 100K people (2 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#48. Mercer County
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- Chlamydia cases: 288.7 per 100K people (195 cases)
- Gonorrhea cases: 105.1 per 100K people (71 case)
- Syphilis cases (non-congenital): 53.3 per 100K people (36 cases)
--- Primary and secondary syphilis: 40.0 per 100K people (27 cases)
--- Nonprimary and nonsecondary early syphilis: 13.3 per 100K people (9 cases)
#47. St. Francois County
marekuliasz // Shutterstock
- Chlamydia cases: 289.7 per 100K people (25 cases)
- Gonorrhea cases: 81.1 per 100K people (7 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#46. Oregon County
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- Chlamydia cases: 292.5 per 100K people (96 cases)
- Gonorrhea cases: 106.7 per 100K people (35 cases)
- Syphilis cases (non-congenital): 15.2 per 100K people (5 cases)
--- Primary and secondary syphilis: 3.0 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 12.2 per 100K people (4 cases)
#45. Lafayette County
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- Chlamydia cases: 296.0 per 100K people (58 cases)
- Gonorrhea cases: 71.4 per 100K people (14 cases)
- Syphilis cases (non-congenital): 5.1 per 100K people (1 case)
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 5.1 per 100K people (1 case)
#44. Vernon County
APN Photography // Shutterstock
- Chlamydia cases: 298.4 per 100K people (29 cases)
- Gonorrhea cases: 92.6 per 100K people (9 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#43. Grundy County
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- Chlamydia cases: 302.6 per 100K people (6 cases)
- Gonorrhea cases: 0 cases
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#42. Worth County
HMBSoFL Photography // Shutterstock
- Chlamydia cases: 306.2 per 100K people (68 cases)
- Gonorrhea cases: 144.1 per 100K people (32 cases)
- Syphilis cases (non-congenital): 22.5 per 100K people (5 cases)
--- Primary and secondary syphilis: 4.5 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 18.0 per 100K people (4 cases)
#41. Henry County
Rachael Martin // Shutterstock
- Chlamydia cases: 310.0 per 100K people (31 case)
- Gonorrhea cases: 30.0 per 100K people (3 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#40. Lewis County
Roberto Galan // Shutterstock
- Chlamydia cases: 310.8 per 100K people (33 cases)
- Gonorrhea cases: 273.1 per 100K people (29 cases)
- Syphilis cases (non-congenital): 131.9 per 100K people (14 cases)
--- Primary and secondary syphilis: 94.2 per 100K people (10 cases)
--- Nonprimary and nonsecondary early syphilis: 37.7 per 100K people (4 cases)
#39. Ripley County
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- Chlamydia cases: 315.1 per 100K people (12 cases)
- Gonorrhea cases: 157.6 per 100K people (6 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#38. Knox County
e.backlund // Shutterstock
- Chlamydia cases: 321.6 per 100K people (81 case)
- Gonorrhea cases: 142.9 per 100K people (36 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#37. Adair County
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- Chlamydia cases: 322.7 per 100K people (145 cases)
- Gonorrhea cases: 155.8 per 100K people (70 cases)
- Syphilis cases (non-congenital): 6.7 per 100K people (3 cases)
--- Primary and secondary syphilis: 2.2 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 4.5 per 100K people (2 cases)
#36. Phelps County
Logan Bush // Shutterstock
- Chlamydia cases: 330.8 per 100K people (106 cases)
- Gonorrhea cases: 156.0 per 100K people (50 cases)
- Syphilis cases (non-congenital): 37.4 per 100K people (12 cases)
--- Primary and secondary syphilis: 28.1 per 100K people (9 cases)
--- Nonprimary and nonsecondary early syphilis: 9.4 per 100K people (3 cases)
#35. Polk County
Roberto Galan // Shutterstock
- Chlamydia cases: 333.6 per 100K people (78 cases)
- Gonorrhea cases: 136.9 per 100K people (32 cases)
- Syphilis cases (non-congenital): 38.5 per 100K people (9 cases)
--- Primary and secondary syphilis: 25.7 per 100K people (6 cases)
--- Nonprimary and nonsecondary early syphilis: 12.8 per 100K people (3 cases)
#34. Mcdonald County
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- Chlamydia cases: 338.9 per 100K people (50 cases)
- Gonorrhea cases: 61.0 per 100K people (9 cases)
- Syphilis cases (non-congenital): 13.6 per 100K people (2 cases)
--- Primary and secondary syphilis: 6.8 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 6.8 per 100K people (1 case)
#33. Livingston County
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- Chlamydia cases: 339.6 per 100K people (16 cases)
- Gonorrhea cases: 0 cases
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#32. Putnam County
PICTOR PICTURES // Shutterstock
- Chlamydia cases: 352.1 per 100K people (81 case)
- Gonorrhea cases: 113.0 per 100K people (26 cases)
- Syphilis cases (non-congenital): 4.3 per 100K people (1 case)
--- Primary and secondary syphilis: 4.3 per 100K people (1 case)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#31. Ray County
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- Chlamydia cases: 354.2 per 100K people (128 cases)
- Gonorrhea cases: 290.6 per 100K people (105 cases)
- Syphilis cases (non-congenital): 22.1 per 100K people (8 cases)
--- Primary and secondary syphilis: 11.1 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: 11.1 per 100K people (4 cases)
#30. Laclede County
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- Chlamydia cases: 362.0 per 100K people (215 cases)
- Gonorrhea cases: 143.1 per 100K people (85 cases)
- Syphilis cases (non-congenital): 30.3 per 100K people (18 cases)
--- Primary and secondary syphilis: 23.6 per 100K people (14 cases)
--- Nonprimary and nonsecondary early syphilis: 6.7 per 100K people (4 cases)
#29. Newton County
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- Chlamydia cases: 370.3 per 100K people (406 cases)
- Gonorrhea cases: 113.1 per 100K people (124 cases)
- Syphilis cases (non-congenital): 18.2 per 100K people (20 cases)
--- Primary and secondary syphilis: 12.8 per 100K people (14 cases)
--- Nonprimary and nonsecondary early syphilis: 5.5 per 100K people (6 cases)
#28. Cass County
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- Chlamydia cases: 370.5 per 100K people (160 cases)
- Gonorrhea cases: 164.4 per 100K people (71 case)
- Syphilis cases (non-congenital): 57.9 per 100K people (25 cases)
--- Primary and secondary syphilis: 27.8 per 100K people (12 cases)
--- Nonprimary and nonsecondary early syphilis: 30.1 per 100K people (13 cases)
#27. Pettis County
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- Chlamydia cases: 375.6 per 100K people (93 cases)
- Gonorrhea cases: 141.4 per 100K people (35 cases)
- Syphilis cases (non-congenital): 12.1 per 100K people (3 cases)
--- Primary and secondary syphilis: 12.1 per 100K people (3 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#26. Randolph County
TommyBrison // Shutterstock
- Chlamydia cases: 419.1 per 100K people (455 cases)
- Gonorrhea cases: 130.8 per 100K people (142 cases)
- Syphilis cases (non-congenital): 13.8 per 100K people (15 cases)
--- Primary and secondary syphilis: 8.3 per 100K people (9 cases)
--- Nonprimary and nonsecondary early syphilis: 5.5 per 100K people (6 cases)
#25. Platte County
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- Chlamydia cases: 422.4 per 100K people (17 cases)
- Gonorrhea cases: 49.7 per 100K people (2 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#24. Schuyler County
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- Chlamydia cases: 445.4 per 100K people (1,138 cases)
- Gonorrhea cases: 161.2 per 100K people (412 cases)
- Syphilis cases (non-congenital): 27.0 per 100K people (69 cases)
--- Primary and secondary syphilis: 16.0 per 100K people (41 case)
--- Nonprimary and nonsecondary early syphilis: 11.0 per 100K people (28 cases)
#23. Clay County
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- Chlamydia cases: 459.4 per 100K people (107 cases)
- Gonorrhea cases: 197.5 per 100K people (46 cases)
- Syphilis cases (non-congenital): 17.2 per 100K people (4 cases)
--- Primary and secondary syphilis: 17.2 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: 0 cases
#22. Saline County
RozenskiP // Shutterstock
- Chlamydia cases: 470.5 per 100K people (210 cases)
- Gonorrhea cases: 273.3 per 100K people (122 cases)
- Syphilis cases (non-congenital): 15.7 per 100K people (7 cases)
--- Primary and secondary syphilis: 4.5 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 11.2 per 100K people (5 cases)
#21. Callaway County
Photos BrianScantlebury // Shutterstock
- Chlamydia cases: 473.4 per 100K people (135 cases)
- Gonorrhea cases: 347.1 per 100K people (99 cases)
- Syphilis cases (non-congenital): 0 cases
--- Primary and secondary syphilis: 0 cases
--- Nonprimary and nonsecondary early syphilis: 0 cases
#20. Marion County
Jacob Boomsma // Shutterstock
- Chlamydia cases: 518.8 per 100K people (426 cases)
- Gonorrhea cases: 252.1 per 100K people (207 cases)
- Syphilis cases (non-congenital): 29.2 per 100K people (24 cases)
--- Primary and secondary syphilis: 24.4 per 100K people (20 cases)
--- Nonprimary and nonsecondary early syphilis: 4.9 per 100K people (4 cases)
#19. Cape Girardeau County
Jon Kraft // Shutterstock
- Chlamydia cases: 559.6 per 100K people (303 cases)
- Gonorrhea cases: 105.3 per 100K people (57 cases)
- Syphilis cases (non-congenital): 12.9 per 100K people (7 cases)
--- Primary and secondary syphilis: 11.1 per 100K people (6 cases)
--- Nonprimary and nonsecondary early syphilis: 1.8 per 100K people (1 case)
#18. Johnson County
Sabrina Janelle Gordon // Shutterstock
- Chlamydia cases: 577.3 per 100K people (160 cases)
- Gonorrhea cases: 350.0 per 100K people (97 cases)
- Syphilis cases (non-congenital): 83.0 per 100K people (23 cases)
--- Primary and secondary syphilis: 54.1 per 100K people (15 cases)
--- Nonprimary and nonsecondary early syphilis: 28.9 per 100K people (8 cases)
#17. Dunklin County
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- Chlamydia cases: 583.8 per 100K people (719 cases)
- Gonorrhea cases: 248.5 per 100K people (306 cases)
- Syphilis cases (non-congenital): 45.5 per 100K people (56 cases)
--- Primary and secondary syphilis: 27.6 per 100K people (34 cases)
--- Nonprimary and nonsecondary early syphilis: 17.9 per 100K people (22 cases)
#16. Jasper County
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- Chlamydia cases: 589.1 per 100K people (248 cases)
- Gonorrhea cases: 351.5 per 100K people (148 cases)
- Syphilis cases (non-congenital): 197.1 per 100K people (83 cases)
--- Primary and secondary syphilis: 114.0 per 100K people (48 cases)
--- Nonprimary and nonsecondary early syphilis: 83.1 per 100K people (35 cases)
#15. Butler County
Roberto Galan // Shutterstock
- Chlamydia cases: 597.3 per 100K people (226 cases)
- Gonorrhea cases: 327.7 per 100K people (124 cases)
- Syphilis cases (non-congenital): 76.6 per 100K people (29 cases)
--- Primary and secondary syphilis: 39.6 per 100K people (15 cases)
--- Nonprimary and nonsecondary early syphilis: 37.0 per 100K people (14 cases)
#14. Scott County
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- Chlamydia cases: 607.5 per 100K people (469 cases)
- Gonorrhea cases: 319.9 per 100K people (247 cases)
- Syphilis cases (non-congenital): 15.5 per 100K people (12 cases)
--- Primary and secondary syphilis: 9.1 per 100K people (7 cases)
--- Nonprimary and nonsecondary early syphilis: 6.5 per 100K people (5 cases)
#13. Cole County
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- Chlamydia cases: 616.9 per 100K people (332 cases)
- Gonorrhea cases: 184.0 per 100K people (99 cases)
- Syphilis cases (non-congenital): 9.3 per 100K people (5 cases)
--- Primary and secondary syphilis: 3.7 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 5.6 per 100K people (3 cases)
#12. Pulaski County
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- Chlamydia cases: 620.0 per 100K people (6,183 cases)
- Gonorrhea cases: 326.5 per 100K people (3,256 cases)
- Syphilis cases (non-congenital): 29.0 per 100K people (289 cases)
--- Primary and secondary syphilis: 18.4 per 100K people (183 cases)
--- Nonprimary and nonsecondary early syphilis: 10.6 per 100K people (106 cases)
#11. St. Louis County
APN Photography // Shutterstock
- Chlamydia cases: 620.1 per 100K people (520 cases)
- Gonorrhea cases: 349.4 per 100K people (293 cases)
- Syphilis cases (non-congenital): 50.1 per 100K people (42 cases)
--- Primary and secondary syphilis: 31.0 per 100K people (26 cases)
--- Nonprimary and nonsecondary early syphilis: 19.1 per 100K people (16 cases)
#10. Buchanan County
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- Chlamydia cases: 620.4 per 100K people (155 cases)
- Gonorrhea cases: 392.3 per 100K people (98 cases)
- Syphilis cases (non-congenital): 20.0 per 100K people (5 cases)
--- Primary and secondary syphilis: 8.0 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 12.0 per 100K people (3 cases)
#9. Audrain County
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- Chlamydia cases: 645.1 per 100K people (1,941 case)
- Gonorrhea cases: 388.9 per 100K people (1,170 cases)
- Syphilis cases (non-congenital): 59.8 per 100K people (180 cases)
--- Primary and secondary syphilis: 39.2 per 100K people (118 cases)
--- Nonprimary and nonsecondary early syphilis: 20.6 per 100K people (62 cases)
#8. Greene County
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- Chlamydia cases: 661.9 per 100K people (1,230 cases)
- Gonorrhea cases: 269.6 per 100K people (501 case)
- Syphilis cases (non-congenital): 16.7 per 100K people (31 case)
--- Primary and secondary syphilis: 11.3 per 100K people (21 case)
--- Nonprimary and nonsecondary early syphilis: 5.4 per 100K people (10 cases)
#7. Boone County
Joseph Sohm // Shutterstock
- Chlamydia cases: 667.3 per 100K people (107 cases)
- Gonorrhea cases: 286.9 per 100K people (46 cases)
- Syphilis cases (non-congenital): 224.5 per 100K people (36 cases)
--- Primary and secondary syphilis: 149.7 per 100K people (24 cases)
--- Nonprimary and nonsecondary early syphilis: 74.8 per 100K people (12 cases)
#6. New Madrid County
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- Chlamydia cases: 775.0 per 100K people (164 cases)
- Gonorrhea cases: 94.5 per 100K people (20 cases)
- Syphilis cases (non-congenital): 18.9 per 100K people (4 cases)
--- Primary and secondary syphilis: 14.2 per 100K people (3 cases)
--- Nonprimary and nonsecondary early syphilis: 4.7 per 100K people (1 case)
#5. Nodaway County
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- Chlamydia cases: 853.4 per 100K people (107 cases)
- Gonorrhea cases: 414.7 per 100K people (52 cases)
- Syphilis cases (non-congenital): 47.9 per 100K people (6 cases)
--- Primary and secondary syphilis: 16.0 per 100K people (2 cases)
--- Nonprimary and nonsecondary early syphilis: 31.9 per 100K people (4 cases)
#4. Mississippi County
Jon Kraft // Shutterstock
- Chlamydia cases: 879.4 per 100K people (6,304 cases)
- Gonorrhea cases: 466.6 per 100K people (3,345 cases)
- Syphilis cases (non-congenital): 62.2 per 100K people (446 cases)
--- Primary and secondary syphilis: 41.8 per 100K people (300 cases)
--- Nonprimary and nonsecondary early syphilis: 20.4 per 100K people (146 cases)
#3. Jackson County
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- Chlamydia cases: 938.6 per 100K people (143 cases)
- Gonorrhea cases: 571.0 per 100K people (87 cases)
- Syphilis cases (non-congenital): 45.9 per 100K people (7 cases)
--- Primary and secondary syphilis: 26.3 per 100K people (4 cases)
--- Nonprimary and nonsecondary early syphilis: 19.7 per 100K people (3 cases)
#2. Pemiscot County
Sean Pavone // Shutterstock
- Chlamydia cases: 1,246.1 per 100K people (3,655 cases)
- Gonorrhea cases: 790.6 per 100K people (2,319 cases)
- Syphilis cases (non-congenital): 94.8 per 100K people (278 cases)
--- Primary and secondary syphilis: 52.5 per 100K people (154 cases)
--- Nonprimary and nonsecondary early syphilis: 42.3 per 100K people (124 cases)

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

#1. St. Louis City
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