Table 9. Chlamydia – Counties and Independent Cities* Ranked by Number of Reported Cases, United States, 2009
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| Rank† | County/Independent City | Cases | Rate per 100,000 Population | Cumulative Percent |
|---|---|---|---|---|
| 1 | Los Angeles County, CA | 46,977 | 476.3 | 3 |
| 2 | Cook County, IL | 35,531 | 671.1 | 6 |
| 3 | Wayne County, MI | 18,778 | 963.0 | 8 |
| 4 | Kings County, NY | 18,693 | 731.2 | 9 |
| 5 | Philadelphia County, PA | 18,104 | 1,250.8 | 11 |
| 6 | Bronx County, NY | 17,174 | 1,233.9 | 12 |
| 7 | Harris County, TX | 16,751 | 420.4 | 13 |
| 8 | Maricopa County, AZ | 14,665 | 370.8 | 15 |
| 9 | Dallas County, TX | 14,333 | 594.0 | 16 |
| 10 | San Diego County, CA | 14,169 | 472.1 | 17 |
| 11 | Shelby County, TN | 10,827 | 1,193.9 | 18 |
| 12 | Queens County, NY | 10,757 | 469.1 | 19 |
| 13 | Bexar County, TX | 10,639 | 655.6 | 19 |
| 14 | New York County, NY | 10,520 | 643.5 | 20 |
| 15 | Milwaukee County, WI | 9,917 | 1,040.3 | 21 |
| 16 | Cuyahoga County, OH | 8,902 | 693.3 | 22 |
| 17 | San Bernardino County, CA | 8,654 | 429.4 | 22 |
| 18 | Miami-Dade County, FL | 8,318 | 346.8 | 23 |
| 19 | Riverside County, CA | 8,280 | 394.2 | 24 |
| 20 | Clark County, NV | 8,177 | 438.3 | 24 |
| 21 | Orange County, CA | 7,915 | 262.9 | 25 |
| 22 | Tarrant County, TX | 7,834 | 447.6 | 26 |
| 23 | Baltimore (City), MD | 7,822 | 1,228.1 | 26 |
| 24 | Franklin County, OH | 7,730 | 684.6 | 27 |
| 25 | Broward County, FL | 6,949 | 396.8 | 28 |
| 26 | Alameda County, CA | 6,778 | 459.7 | 28 |
| 27 | Marion County, IN | 6,630 | 753.1 | 29 |
| 28 | Hillsborough County, FL | 6,611 | 559.9 | 29 |
| 29 | Washington, D.C. | 6,549 | 1,106.6 | 30 |
| 30 | Orange County, FL | 6,016 | 560.8 | 30 |
| 31 | Travis County, TX | 5,981 | 599.0 | 31 |
| 32 | King County, WA | 5,908 | 315.0 | 31 |
| 33 | Fulton County, GA | 5,876 | 579.0 | 32 |
| 34 | Mecklenburg County, NC | 5,822 | 653.8 | 32 |
| 35 | Suffolk County, MA | 5,703 | 778.4 | 32 |
| 36 | Denver County, CO | 5,670 | 947.0 | 33 |
| 37 | Hamilton County, OH | 5,606 | 658.4 | 33 |
| 38 | Duval County, FL | 5,539 | 650.9 | 34 |
| 39 | Jackson County, MO | 5,493 | 821.8 | 34 |
| 40 | Fresno County, CA | 5,416 | 595.7 | 35 |
| 41 | Santa Clara County, CA | 5,392 | 305.6 | 35 |
| 42 | Jefferson County, AL | 5,284 | 801.2 | 36 |
| 43 | St. Louis County, MO | 5,264 | 530.7 | 36 |
| 44 | Prince George's County, MD | 5,224 | 636.4 | 36 |
| 45 | Monroe County, NY | 5,118 | 698.5 | 37 |
| 46 | Essex County, NJ | 5,014 | 650.6 | 37 |
| 47 | Erie County, NY | 4,990 | 548.4 | 38 |
| 48 | Kern County, CA | 4,987 | 623.0 | 38 |
| 49 | Sacramento County, CA | 4,924 | 353.2 | 38 |
| 50 | Allegheny County, PA | 4,916 | 404.6 | 39 |
| 51 | Honolulu County, HI | 4,740 | 523.7 | 39 |
| 52 | Hennepin County, MN | 4,737 | 415.2 | 40 |
| 53 | St. Louis (City), MO | 4,390 | 1,238.8 | 40 |
| 54 | Oklahoma 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.
- Page last reviewed: November 22, 2010 (archived document)
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