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Table 9. Chlamydia - Reported Cases and Rates of Reported Cases in Counties and Independent Cities* Ranked by Number of Reported Cases, United States, 2013

This web page is archived for historical purposes and is no longer being updated. Newer data is available on the 

STD Data and Statistics page.

Rank†County/Independent CityCasesRate per 100,000 PopulationCumulative Percentage
1Los Angeles County, CA50,775509.63
2Cook County, IL34,589661.26
3Harris County, TX23,698557.17
4Philadelphia County, PA19,5701,264.59
5Maricopa County, AZ18,940480.410
6Kings County, NY17,808694.111
7Bronx County, NY16,1161,144.212
8Wayne County, MI15,723877.214
9San Diego County, CA14,706462.915
10Dallas County, TX14,691598.716
11Bexar County, TX11,826662.317
12New York County, NY11,426705.717
13Queens County, NY11,092488.018
14San Bernardino County, CA10,966526.919
15Miami-Dade County, FL10,287397.020
16Cuyahoga County, OH10,025792.420
17Milwaukee County, WI9,7341,019.021
18Clark County, NV9,286464.122
19Marion County, IN9,2821,010.022
20Riverside County, CA8,853390.223
21Tarrant County, TX8,774466.724
22Orange County, CA8,611278.724
23Shelby County, TN8,471900.425
24Broward County, FL8,048443.425
25Sacramento County, CA7,965549.326
26Franklin County, OH7,825654.527
27Baltimore (City), MD7,7651,249.727
28Hillsborough County, FL7,167560.928
29Travis County, TX6,839624.228
30Orange County, FL6,803565.929
31King County, WA6,792338.329
32Hamilton County, OH6,584820.930
33Santa Clara County, CA6,517354.730
34Kern County, CA6,508760.130
35Alameda County, CA6,479416.731
36Washington, D.C.6,4141,014.431
37Fresno County, CA6,390674.132
38Prince George's County, MD6,163699.432
39Allegheny County, PA6,095495.833
40Mecklenburg County, NC6,087628.233
41Suffolk County, MA5,785777.134
42Hennepin County, MN5,766486.834
43Duval County, FL5,720650.334
44El Paso County, TX5,583674.835
45Denver County, CO5,380848.235
46Jefferson County, AL5,290801.536
47Essex County, NJ5,221662.836
48St. Louis County, MO5,211520.936
49Pima County, AZ5,192523.237
50Honolulu County, HI5,185531.037
51San Francisco County, CA5,112619.037
52Jackson County, MO5,078749.738
53Jefferson County, KY4,944658.538
54Erie County, NY4,892532.338
55Bernalillo County, NM4,604683.639
56Monroe County, NY4,582612.739
57Palm Beach County, FL4,486330.739
58Contra Costa County, CA4,443411.540
59Fulton County, GA4,416451.640
60Oklahoma County, OK4,300579.740
61Pierce County, WA4,294529.041
62Wake County, NC4,210442.241
63St. Louis (City), MO4,1281,297.441
64Pinellas County, FL4,080442.842
65Orleans Parish, LA4,0641,100.642
66Davidson County, TN3,965611.642
67Multnomah County, OR3,933518.042
68Salt Lake County, UT3,806357.843
69New Haven County, CT3,799440.343
70Hartford County, CT3,759418.943

* Accounting for 43% of reported chlamydia cases.

† Counties and independent cities were ranked in descending order by number of cases reported then by rate in 2013.

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