Table 9. Chlamydia — Reported Cases and Rates of Reported Cases in Counties and Independent Cities* Ranked by Number of Reported Cases, United States, 2018

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Rank* County/Independent City Cases Rate per 100,000 Population Cumulative Percentage
1 Los Angeles County, CA 67,878 667.9 4
2 Cook County, IL 43,271 830.3 6
3 Harris County, TX 27,415 589.2 8
4 Maricopa County, AZ 26,464 614.4 9
5 San Diego County, CA 21,912 656.5 11
6 Kings County, NY 21,656 817.6 12
7 Philadelphia County, PA 20,206 1,278.2 13
8 Dallas County, TX 18,088 690.9 14
9 Bronx County, NY 17,689 1,202.4 15
10 New York County, NY 17,218 1,034.3 16
11 Wayne County, MI 15,114 861.9 17
12 Orange County, CA 14,265 447.1 18
13 Queens County, NY 14,059 596.1 18
14 Clark County, NV 13,695 621.3 19
15 Miami-Dade County, FL 13,395 486.8 20
16 San Bernardino County, CA 13,333 618.0 21
17 Sacramento County, CA 11,457 748.5 21
18 Riverside County, CA 11,453 472.6 22
19 Broward County, FL 11,322 584.9 23
20 Milwaukee County, WI 11,195 1,175.8 23
21 Cuyahoga County, OH 11,025 883.0 24
22 Bexar County, TX 10,544 538.3 25
23 Marion County, IN 10,408 1,095.5 25
24 King County, WA 10,233 467.5 26
25 Franklin County, OH 10,161 786.5 26
26 Orange County, FL 9,885 732.8 27
27 Shelby County, TN 9,724 1,037.8 27
28 Alameda County, CA 9,701 583.3 28
29 Tarrant County, TX 9,575 466.1 29
30 San Francisco County, CA 9,491 1,073.2 29
31 Mecklenburg County, NC 9,182 852.7 30
32 Washington, D.C. 9,014 1,298.9 30
33 Travis County, TX 8,992 733.0 31
34 Hillsborough County, FL 8,782 623.5 31
35 Fulton County, GA 8,376 804.3 32
36 Santa Clara County, CA 8,315 429.0 32
37 Baltimore (City), MD 8,013 1,310.1 33
38 Prince George's County, MD 8,013 877.9 33
39 Hennepin County, MN 7,866 628.3 33
40 Denver County, CO 7,466 1,059.6 34
41 Fresno County, CA 7,129 720.6 34
42 Duval County, FL 7,112 758.3 35
43 Hamilton County, OH 6,954 854.5 35
44 Kern County, CA 6,948 777.9 35
45 Suffolk County, MA 6,934 869.0 36
46 Pima County, AZ 6,688 653.9 36
47 Wake County, NC 6,482 604.5 37
48 Essex County, NJ 6,479 801.6 37
49 St. Louis County, MO 6,450 647.1 37
50 Jackson County, MO 6,437 921.0 38
51 Contra Costa County, CA 6,189 539.4 38
52 Palm Beach County, FL 6,025 409.5 38
53 Pierce County, WA 5,848 667.0 39
54 Oklahoma County, OK 5,820 738.6 39
55 DeKalb County, GA 5,792 768.9 39
56 Honolulu County, HI 5,721 578.7 40
57 El Paso County, TX 5,700 678.2 40
58 Allegheny County, PA 5,660 462.8 40
59 Multnomah County, OR 5,501 681.2 41
60 Erie County, NY 5,449 588.7 41
61 Middlesex County, MA 5,411 337.6 41
62 Davidson County, TN 5,372 777.2 42
63 Monroe County, NY 5,347 715.2 42
64 Salt Lake County, UT 5,286 465.5 42
65 Guilford County, NC 5,140 975.4 43
66 Suffolk County, NY 5,127 343.4 43
67 Jefferson County, AL 5,121 776.9 43
68 Bernalillo County, NM 5,050 746.2 43
69 Orleans Parish, LA 4,974 1,264.7 44
70 Hartford County, CT 4,858 542.6 44

* The top 70 counties and independent cities ranked in descending order by number of cases reported in 2018 then by rate are displayed.

NOTE: Relative rankings of counties may be impacted by completeness of the variable used to identify county. In 2018, the variable used to identify county was complete for ≤95% of cases in Connecticut, Georgia, Hawaii, and South Dakota. See Section A1.4 in the Appendix for more information.

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Page last reviewed: August 20, 2019
Content source: Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention