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Table 9. Chlamydia – Counties and Independent Cities* Ranked by Number of Reported Cases, United States, 2009

Rank† County/Independent City Cases Rate per 100,000 Population Cumulative Percent
1Los Angeles County, CA 46,977 476.3 3
2Cook County, IL 35,531 671.1 6
3Wayne County, MI 18,778 963.0 8
4Kings County, NY 18,693 731.2 9
5Philadelphia County, PA 18,1041,250.8 11
6Bronx County, NY 17,1741,233.9 12
7Harris County, TX 16,751 420.4 13
8Maricopa County, AZ 14,665 370.8 15
9Dallas County, TX 14,333 594.0 16
10San Diego County, CA 14,169 472.1 17
11Shelby County, TN 10,8271,193.9 18
12Queens County, NY 10,757 469.1 19
13Bexar County, TX 10,639 655.6 19
14New York County, NY 10,520 643.5 20
15Milwaukee County, WI 9,9171,040.3 21
16Cuyahoga County, OH 8,902 693.3 22
17San Bernardino County, CA 8,654 429.4 22
18Miami-Dade County, FL 8,318 346.8 23
19Riverside County, CA 8,280 394.2 24
20Clark County, NV 8,177 438.3 24
21Orange County, CA 7,915 262.9 25
22Tarrant County, TX 7,834 447.6 26
23Baltimore (City), MD 7,8221,228.1 26
24Franklin County, OH 7,730 684.6 27
25Broward County, FL 6,949 396.8 28
26Alameda County, CA 6,778 459.7 28
27Marion County, IN 6,630 753.1 29
28Hillsborough County, FL 6,611 559.9 29
29Washington, D.C. 6,5491,106.6 30
30Orange County, FL 6,016 560.8 30
31Travis County, TX 5,981 599.0 31
32King County, WA 5,908 315.0 31
33Fulton County, GA 5,876 579.0 32
34Mecklenburg County, NC 5,822 653.8 32
35Suffolk County, MA 5,703 778.4 32
36Denver County, CO 5,670 947.0 33
37Hamilton County, OH 5,606 658.4 33
38Duval County, FL 5,539 650.9 34
39Jackson County, MO 5,493 821.8 34
40Fresno County, CA 5,416 595.7 35
41Santa Clara County, CA 5,392 305.6 35
42Jefferson County, AL 5,284 801.2 36
43St. Louis County, MO 5,264 530.7 36
44Prince George's County, MD 5,224 636.4 36
45Monroe County, NY 5,118 698.5 37
46Essex County, NJ 5,014 650.6 37
47Erie County, NY 4,990 548.4 38
48Kern County, CA 4,987 623.0 38
49Sacramento County, CA 4,924 353.2 38
50Allegheny County, PA 4,916 404.6 39
51Honolulu County, HI 4,740 523.7 39
52Hennepin County, MN 4,737 415.2 40
53St. Louis (City), MO 4,3901,238.8 40
54Oklahoma County, OK 4,231 598.8 40

* Accounting for 40% of reported chlamydia cases.

† Counties and independent cities were ranked in descending order by number of cases reported in 2009.

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